I got a DCU theory that ties into Lanterns and Superman
Hal Jordan in the DCU is 60 years old, he's much older than most of the other heroes. Including Superman.
We know that in 2025, Superman is 30 years old based on the opening text. We don't know when exactly Hal became Green Lantern, but based on trailer footage, it seems like it's been at least 30+ years.
What are the chances that Hal Jordan has been to Krypton?
I think sometimes fans discuss the destruction of Krypton like it's ancient history, but it just happened 30 years ago. In this universe, Krypton was destroyed in the 1995. That's the same year TOY STORY was released.
I think there's a very good chance Hal knew about Krypton before it's destruction and potentially even visited the planet at one point.