OSDev.org

People no longer use the GDT to divide the RAM, like having one part for the operating system and another for user programs to provide more protection for the RAM, so no one can access someone else’s part. Instead, they set up the GDT with a flat memory model, meaning from address 0 to 4GB for the entire RAM, just to enter Protected Mode, nothing more. It’s like a formality, and instead of that, they use paging, right? Is what I’m saying correct?

Deleting your Reddit post before posting the exact same question here doesn't make it any harder to figure out you're the same person.

And yes, what you're saying is correct.