Yup.

I cook a LOT in my Instantpot. Rice button sets for 12 mins after it gets up to pressure, so its ~30 mins to said rice - however, I usually just leave it in while I cook the other things - and typically its been an hour that the rice is done and just sitting there waiting to be eaten.

FYI - if you dont yet have an instant pot, it will change your cooking life.

Get one.

Then what is the point of using the pressure cooker if he wastes 24 minutes? Spaghetti are ready in 10 minutes in a normal pot, and with a good induction hob the water is boiling in something like 5 minutes.

I'm not him, so just speculating here, but maybe he's making sauce and pasta together all-in-one? And perhaps uses thick pastas or doesn't want al dente?

That assumes start-end time is more important than labor time.