You're correct. This is basically a conspiracy theory more about slamming Disney than investigation. There are a few superficial similarities and sometime in like the 90s the internet ran with it to the point where it's been treated as an unquestioned fact in many corners. Thing was, in the 90s and early 00s the internet didn't really have video blasting from every corner, so the conspiracy could be shown via a few pictures. If the video were widely available the theory falls apart.
Most you can really make an argument for is that Disney lifted a few visuals, but movies do that all the time.
Ok, let me see if I understand this: We have two differet shows, both of them feature male lions as main characters, one called (S)imba and the other called (K)imba, both have a talking bird as sidekicks, both had their father killed when they were cubs, both of them talked to their dead father in a vision on the clouds.
Both shows feature a black haired lion with a scar in its left eye as a villain (with a group of hyenas as henchmen).
How you can call all of those similarities "superficial" is beyond me.
Lol, I was thinking the same thing.