I think all these things can exist in tandem to what the tiktok discourse is probably not about, which is that plain language and easy reading is still needed and is a way to be accessible.
It's ableist to assume all disabled people can't understand big words, but it's also ableist to ignore the needs of those with intellectual disabilities.
A dictionary being available is great for when you have the time and energy to read something multiple times over. You know, something to do for improving your reading level. If you're communicating essential ideas and important information though, it should be necessary for everyone to be able to understand it their first time reading through.
Anti intellectualism is a problem but doubling down to not make an effort into accessibility is going to exacerbate it if anything.
I feel like if you think that a dictionary is all you need to be able to fully comprehend a text above your reading level, you have not been in a situation where your reading level is far below what you're reading. I need anyone who thinks this way to read one chapter of any of Judith Butlers earlier works, any paper with a large use of specific anatomical terms, hell to look at most laws. You will realize how overwhelming it is to actually understand, how you feel like you can't fully understand even if you technically know what all the words mean. A dictionary is good if you don't know one or two words, not most of them.
@spicebowl put these tags that go with this well
What I'm going to say will sound nit picky but it's actually important: the lower reading level would be considered an impairment while the challenges that come from not accommodating it (being taken advantage of) would be the social part, disability. And it makes sense for those who didn't receive a good education (which includes many kids in special ed programs & those in poverty) to both have their reading level pushed and to still use language they can understand to communicate in the meantime.
This doesn't negate the fact that autistic people can use unique vocabulary that has social consequences, an accommodation for one person can be detrimental for another. I'm allistic but my ADHD both makes reading comp and English a lot harder, while also making my train of thought a lot harder to understand. I remember reading Georg Simmels work in a grad level class and going "why is he considered intelligent writing this way when I've been told all my life to stop because it's too confusing?!" It's incredibly frustrating when you're constantly misunderstood and need to rework how you write and communicate. All of these things can exist at the same time.
I already said it's ableist to ignore those with intellectual disabilities, but it should be made clear that it is so much more insulting to say that an accommodation is ableist because it's associated with a lack of what you find important. The accommodation is insulting because your disability is an insult.
Lastly, AI can be a way to accommodate this, but from what I've seen, that technology would be behind a paywall. It's actually useful and would have to be tailored to someones unique needs. A lot of the free AI we get is bloated garbage that serves no purpose. If someone actually needs it then they can be charged for it, and the people who would need it aren't likely to have that money. This isn't an endorsement for your phone to give you a vague summary of a text message, frankly that kind of shit can make things more confusing.