They're lying.This was used in an early presentation for The Lion King.
All just one big coincidence.
The shit in the OP is the same shit they've been saying since the movie came out. There is nothing new here.
I understand parallel thinking is real but the amount of coincidences are unbelievable, especially given that the Disney studio is made up of animation nerds who most certainly know their shit and keep up with the global animation community's output.
There is no way that not one of the 200+ animation nerds working at Disney at the time brought up Kimba to anyone else during production. There is no way that they had zero awareness of it until after TLK released. Even if it was all a coincidence when production began I can't believe that the comparison never came up during production.