I think xset has the normal reaction and decision that teams would make in that situation. i mean, riot, a higher up and literally the company organizing everything is telling you to do something, not to mention you get a second chance in the biggest event of the year. anyone would take that. xset never asked first, they only accepted after being presented the choice by riot. i think the bug is stupid and that it happens all the time (which it shouldn't) but that's just how it is. if you replay this round you uncover like 50 instances in international events where other bugs happened that all of a sudden qualify for replay. so I don't think it should've been replayed, but it is SO unfortunate that it happened at 11-12 for them.
also fpx didn't know that xset didn't ask for the replay and that riot initiated it. so maybe their tweets are not as respectful, but it is literally past midnight there, they're exhausted, finally done playing after hours and were relaxed/celebrating. their hard work pays off for this win and want to prepare for next do-or-die match. then suddenly being told that they still have a chance of being eliminated and they have to play right then. especially over a dumb bug that shouldn't have happened, I would be so upset and anxious too.
both are not good positions to be in. we don't even know what would've happened if the turret didn't bug. fpx still had a chance of winning. or xset could've won in ot. but this is an international tournament, there are no "what ifs" random and stupid shit happens all the time and you just accept the outcome and move on. it is neither of the team's faults, especially xset as people are heavily blaming them right now. i think this is a very big mistake from riot (first the bug, then the decision to remake).