I don’t care about wow content creators either, but still took a look at the video.
He is commenting on a reddit post that was made wherein the poster used data from drustvar to aggregate player percentages at each rating bracket for solo/2s/3s for both EU and NA.
Since not all players on the ladder are tallied, the top percent at 2400 is even less than showed, which was at 1.6 percent for 3s. Estimation being less than 1 percent for glad mount.
Iirc venruki did not outright suggest a number, but expressed his personal belief that percentage based rewards + a battle pass like system to incentivize regular consistent participation throughout a season is the better course to take to increase population. He loosely refuted a comment saying that adding unique content to the battle pass would be too difficult. He said it shouldnt be the case that a player capable of consistently placing high in seasons be arbitrarily roadblocked in a season for reasons outside of player ability where the same participation and success results in a 600+ rating difference from one season to the next.
I couldn’t tell however what his point was regarding bringing up crimson and how inflated it was. Either that it being so inflated because people began to realize that glad mount was more obtainable which fed into the inflation in a snowball effect demonstrating an ingredient to the necessary solution of increasing participation or that everyone getting the glad mount easily demonstrates a problem with the static rating reward breakpoints where achieving consistent reward ranges in wildly swinging participation between seasons relies solely on blizzard keeping their finger on the pulse and adjusting MMR more actively week to week.