So the consensus seems to be that through various mechanisms IF is beneficial for muscle growth, not detrimental.

I have to say that I have never noticed any muscle loss when I do it. And I've gone three days without eating a few times.

I think maybe people don't understand the difference between IF and all out calorie deficit dieting. It's two completely different things. Trickle feeding yourself with reduced calories in the hope of losing weight is not IF and completely negates the beneficial effects of IF.