This doesn't make sense.
1) If there is a match-fix, the losing team *has to be* involved in the matchfixing, because they have to willingly throw the game. 9z can lose the game willingly by themselves, without Vitality even knowing about it. But they can't fix win the game by themselves, without Vitality knowing about it because otherwise Vitality would try to win, unless they genuinely beat Vitality by trying hard, which is not a match-fix anyway.
2) If Vitality agreed to throw, it doesn't make sense anyway, because why would Vitality want 9z's money? They are at least 20 times richer with much higher salaries.
3) Finally, the betting site wouldn't be fixing, or that would end their business.
I think this is a very weird coincidence, where bit told his friend (fnx) that they are going to win 2-1 (because 2-0 sounds overconfident), so he should bet on it.