Videos are not allowed on the wiki. It's probably Joy Boy's YT video added by Fandom and you can do nothing about it.
This scene is actually filler and it didn't appear in the manga. Also, Oda wasn't probably even thinking about Haki at this point of the story.
V-Jump confirmed Kaido and Big Mom's bounty to be over 2,000,000,000 belly. Blackbeard is actually a rookie among the Yonko and his bounty is probably the lowest one. I suppose that remaining Yonko have 3 to 5 billion belly bounties.
"Enpress" is an obvious mistake while "Levely" is the only official spelling we have and it wasn't corrected in the volume release.