A minor historical note on this: the original title of Dijkstra's text was "A Case Against the Goto Statement" and it was the Communications of the ACM editor (Niklaus Wirth) that changed it[0].
"goto considered harmful" was at least not wrong. It didn't say who considered it harmful, but at least it was still presented as an opinion.
This title states "Python is Faster Than C++", which neither implies that this is just an opinion, nor that it isn't an absolute statement. You have to figure out yourself that it's probably hyperbolic and just referring to special cases.
I have noticed this a lot too. I'd guess is has to do with the importance of conferences over journals in CS (as opposed to nearby fields where journals dominate). Conferences tend to be more informal and forgiving of titles like that.
Of course this is just a preprint. If they ultimately publish it somewhere the editors/reviewers may make them give a more conservative title.