Please rewatch the video from about 4:40. Your comment doesn't address the "White Tiger", 65% issue.

Ideally, white tiger, purple tiger, and green gorrilla would be elected, as this is the outcome most proportional to voter intent.

But under the logic you describe, purple tiger, with the least votes, would be eliminated after the first round. 2/3 of the populace have indicated they want tigers, but we're about to empanel one tiger and two gorillas.

In actuality, we are not removing the least popular candidate in each round. We are only removing the least popular option if the most popular option does not exceed the mathematical threshold for locking a seat. If they do exceed that threshold, we are removing the top candidate - not the bottom - before we count the next round. The top candidate gets the first seat, and the remaining candidates are competing for the second and third seats.