> Apple markets this as a "Pro" device for professional video editing. That's why I believe it is fair to take their word and compare it against my other options for a professional video editing rig.

That's ridiculous. Threadripper has 8 to 16 times as many cores, runs on hundreds of watts of power and such a CPU alone costs the same as several Mac Minis. Them claiming you can use it for video editing doesn't mean you can expect that a 1.5 pound notebook will measure up to literally the biggest baddest computer you can buy.