I'll paraphrase Post League Time a bit. Blaming the draft is an easy go-to, but rarely that simple.
I don't think the draft was a problem in that last TSM vs. G2 game. If anything, G2's was; they drafted yet another late-game comp when nearly their every loss was them getting smashed in the early game. TSM played aggressive, they got a lead, then did nothing with it. Stood around, gave up Barons, watched Ori and Cait scale, all that good stuff. The last FW game, yeah it was a problem.
I think MarkZ was theorizing that the meta moved in a direction TSM's uncomfortable with. There's some unwillingness/discomfort in Bjerg playing meta assassins like Fizz/Ekko, either from Bjerg himself or the team. Last time I remember him doing so was that Kat game early in NALCS where he kinda fed. He also described how difficult a situation it is drafting for TSM; "our jungler keeps inting so gotta put him on like an Ivern", "gotta have Bjerg on a control mage because that's what the team's used to playing around", "gotta give Turtle a safe ADC or he's going to randomly die", etc.
So yeah. Maybe the blame roulette wheel just landed on Parth, but don't forget there's plenty to go around. The only reason Sven's not being called the worst player at MSI is because Trick exists and dear God, Trick.
But really the moral of the story is to watch Post League Time because it's great.