It wasn't even shot attempts. It was shots. Which means a handful of data points where averages are easily skewed.
You isolated an irrelevant microstat in a tiny sample, ignored that that microstat for Marner was being skewed by some nothing shot from neutral ice and a set play that produced multiple goals, and then compared him to goalscorers he helped improve the stats of, based on this shot-based microstat that had little to do with how Marner provides offensive impact in the first place, in order to create a false narrative to bash him.
McDavid said a lot of things that you conveniently left out, and what you don't seem to realize is that being able to generate offense from higher areas of the offensive zone is not a bad thing.