Complete Reference for D&D

Been doing some research that leads me to believe these items may be intellectual property of WoTC. Am I correct? That would seem to explain why Rune Knight is also absent from the forum created content.

I've come across a lot of pages that seem to either be missing content or not letting me scroll further. For example, I attached a screenshot of the fighter class page. Nothing past the 18th lvl Champion skill appears. I'm expecting to see entries for Eldritch Knight and Battle Master.
Android ...