Now that I’ve tried to find an official source stating it was dnd or that was the creator’s original intent, I realize I am probably just repeating internet rumors/lore.

My bad.

I would, however, argue that they are classless systems. You have a lot of freedom, but there are base stats and a leaning toward a specific role. Even dnd can be like this if you multi-class. There are homebrews from DMs that create all new classes (much like if you wanted to create a non-templates character in d:os).

It uses turn based combat based on initiatives, uses difficulty scores or ac scores to determine if you hit and damage done. It has an action and movement as your general turn (possibly a bonus action if there are leftover APs). It’s a story where you can do almost anything and there are consequences to actions.

I could be stretching some of this, but it definitely is trying to emulate a TTRPG experience in video game form.