Pinching your shoulders blades together, setting the feet, etc. all good on bench. But when you say arch I hope you are not overarching you back and thusting your hips way up in the air. I didn't watch that whole vid but hyperextending the back during anything shouldn't be done on a regular basis.

P.S. I watched the vid. A normal set up. I get a little worried when I see the word arch we already have a natural arch and the word has started to mean bend your back backwards like a pretzel.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.