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When I hear 8088 I'm picturing like an IBM PC original from like 1981, so seeing the video of this running on a 286 isn't as impressive in the end.

Doom barely ran on 386s and lower 486s, so running at all on a 286, let alone better than most any 386, is pretty impressive to me.

In the video it runs in an emulator clocked at 15x the clock speed of a real 286.

You can clock the 8088 to 10MHz, and the NEC V20 drop-in replacement ran up to 16MHz. I'd be curious to see one of those run this.