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
if he did use a patch, it should have looked like one of these two options
The uneven extended fringe threads help reduce the telegraphing of the patch shape to the front.