The way I see it, the Amiga (and the ST) were producing better games when they were released and that's what the video shows. They were more advanced and better gaming machines than the PC pre 1989.
Everyone knows what the PC went on to become, I don't think that needs stating. Many may not be aware of the gaming situation back in 1989 and earlier.
The video is just showing that the PC wasn't the fastest out of the blocks. Nothing wrong with that - the games were compared based on their release dates.
I'm wearing a crash helmet by the way Fed, just in case you go after my skull.