I would like to point out that Dio's official height/weight of 185cm (6'1) and 90kg (200lbs) is from a character sheet that was released more than 35 years after Phantom Blood was originally written in December of 2022, and later updated in 2024. Araki has stated that he doesn't have Dio's original character sheets anymore and this new character sheet was roughly put together from memory.
In his book Manga in Theory and Practice, Araki mentions that he often tends to forget details he finds unimportant. He once gave Trish a birth date that would make her not Diavolo's daughter and shaved 6 whole cm from Narancia's height from his introduction to his final character sheet.
The character sheets aren't absolute nor are they meant to be (by Araki's own admission). Information from the Character Profile sheets may or may not be considered canon if they aren't consistent with the manga. According to Araki in Hirohiko Araki's New Manga Techniques - Chapter 1: What Can Be Changed and What Should Stay Consistent, "the Character Profile is like a sketch—a rough outline of the character. Characters grow and evolve as they live out their lives within the manga. As the story progresses, certain aspects of the profile may no longer align."
Personally, I don't think Dio's character sheet is fully accurate to his original design. Certain inconsistencies in the character sheet support this. For example, according to JoJo 6251 (book by Araki from the 90's), Dio's age when he became a vampire should be 20-21, while the character sheet shows him as only 18, which doesn't make sense with the timelines either. The manga also explicitly states that Dio and Jonathan are the same age, and we know Jonathan's age at the time of his death (April 1868 - February 1889).
It's also important to note Araki's perception of his characters' appearances has changed drastically over the years. Dio's character sheet released at a time when a lot of the early JoJo characters who were known being big and buff have been completely retconned, including Jonathan. If Araki does a character sheet for Jonathan now, he would most likely retcon his measurements as well.
There's this interview with Lucca comics, where the interviewer was asking him why Jonathan is not buff anymore and that he looked like a Sailor Moon character now. Araki said something along the lines that he wasn't good at drawing back then and he draws Jonathan with the "correct proportions" now. You could argue he was just talking about the anatomy but the interviewer follows it up with, "but he looked so gorgeous" to which Araki replied, "he looked like Sylvester Stallone" and for the record, Sylvester Stallone was one of the original inspirations for Jonathan's design. So yes, Araki has pretty much denounced Jonathan's original, muscular design.
Considering Dio and Jonathan have always been depicted around the same size, it's extremely likely that Dio's measurements would've been much closer to Jonathan's if we had his original character sheet from the 80's. In interviews such as Les dossiers du Manga Vol. 7 and Phantom Blood PS2, Araki emphasised being inspired by the muscular physiques of Schwarzenegger and Stallone when making Part 1 and in JoJonium Vol. 3, Araki says, "People always love to compare who's stronger or who's cooler. You've got Godzilla versus Mechagodzilla, Schwarzenegger vs. Stallone... I wanted there to be that sort of contrast or struggle between Dio and Jonathan."
Araki has always depicted Dio and Jonathan roughly around the same size to emphasize that same kind of rivalry and competition.
Interestingly, Araki describes Dio as "tall". However, what constitutes as "tall" for Araki now is very different from what it used to back then. Dio was literally one of the OG buff JoJo characters alongside Jonathan and was created to have an "Schwarzenegger vs. Stallone" type of contrast with Jonathan. It genuinely doesn't make sense for a character like Dio, who Araki very specifically described as "tall" to end up shorter than characters like Abbacchio of all people.
Similarly, Jotaro's official weight of 82 kg doesn't really make sense with his Part 3 design and would actually make him way too skinny. Turns out, Jotaro's Part 3 manga profile only included his height, not his weight. His official weight was added much later on, long after he had already been hit with the twinkification beam, so it may not be accurate to Jotaro's original design in the 90's.
As far as I see it, 185 cm is just an arbitrary number retroactively added to Dio's character decades after his conception and it does not reflect how he was originally supposed to be.
I apologise for the long rambling. I just got a bit carried away but I just wanted to say that I honestly wouldn't take Dio's officially stated measurements at face value.
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