How to fix this canvas?

Firstly, I think the canvas is a loss as you've gone through to the weave in about a hundred little spots. Those little spots need protection from the oil paint.

The YouTube guy over does it as it's a tear not a void it doesn't need a patch just bridge gluing
bridge gluing.jpg

if he did use a patch, it should have looked like one of these two options
patch one-22.JPG
patch two.JPG


The uneven extended fringe threads help reduce the telegraphing of the patch shape to the front.
 
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