I'm glad they left glitches in the game. Allows for much more replay value and time-reducing strategies.
Yet they removed almost every single time-recuding strategy from the game, and we had to find new ways of doing everything.
Really, I do not see what they are talking about as they did remove all the big time savers. RBA is obviously unintentional, and the same goes for pretty much all the other glitches that is used in the current speedrunning route (except for maybe megaflip and bombslide)