In the comments of this original video (link was posted the other day), native speakers said about the same. Both Father and Lion are being used "metaphorically" (even thought it's a literal lion). So it's like "oh wow, here comes the king! The new king is here!"

This is secondhand knowledge from people I'm blindly trusting really do speak the language so not take this as a hard fact.

It's incredible to me how little "papa" and "mama" have altered thorough the ages of human.

There are few theories as to why, but I'm not convinced by any of them yet.

Just for reference in Finland "pappa" is a word for father, but usually more for a grandfather. But like variations of "mama" and "dada" are pretty much universal.