I'd like to offer a bit of an outside perspective here. As someone who enjoys watching speedruns rather than doing them myself, I also find this very strange and disappointing. It's like an athlete being disqualified right before the medal ceremony for violating a rule no one was aware of. I would understand if it were something that completely broke the game, but that's definitely not the case. Finding new glitches and coming up with creative optimizations is a big part of what makes speedrunning so fascinating to watch. I hope this decision is reversed.