Wondering if others have seen this video and any would like some comments about it:

Yes it works

Very cool! I love stuff like this.

if you're running the factory tensioner make sure to back the tension off during the process. with the PK Tensioner the tensioner itself should accommodate the belt run change, but the factory tensioner will not compensate.

I was told to only rotate the engine clockwise looking from the front. No going anti clockwise.

it will be OK to turn the engine either direction for a short bit of adjustment.
NOTE dont make the belt tension too loose as turning it could make the belt jump

It worked satisfyingly well when I didn’t spot a sprocket moving by a tooth when I changed belt earlier this year.