Yes, engine analysis shows that Magnus played extremely poorly. Niemann doesn’t even play that well, it’s just that Magnus plays worse.
The most surprising fact for me from this whole controversy is discovering that Carlsen actually has a rabid fan base who will gladly ignore reality if it goes against him. Chess is actually not that different from football.
Do you have a good source?
If you analyze Carlsen‘s games versus weaker players, you will find situations where he willingly plays suboptimal lines to take the weaker opponent out of his prep.
The reason being that a draw is not enough for Carlsen in these situations.
I‘m curious to see their game analyzed with this taken into account.
I don’t really see what you mean by "this taken into account". Magnus likes to play lines with little advantage and theory on purpose to try to score points against weaker opponents. Even played on purpose these lines remain quite poor. When the opponent plays somewhat accurately that leads to draw-ish to losing positions.
If he deliberately plays suboptimal moves as part of his strategy, then an analysis of one of his games, showing that he played suboptimal moves at times, doesn't yield much information.
The most surprising fact for me from this whole controversy is discovering that Carlsen actually has a rabid fan base who will gladly ignore reality if it goes against him. Chess is actually not that different from football.