How does being wider make them wear more? How does being 1/2” more inward make any difference? Camber and toe angles remain the same.
And back to your previous question… I haven’t assigned root cause of the tire failure to any specific variable. There are confounding variables, none of which alone account for what is happening. From what I read, you have concluded “it’s the car” without any specific description of the mechanism of action aside from parroting “toe out under compression” and now “the tires are 1” wider”.
Once again, tire tread separating from the sidewall is not a tire “wearing out” it’s a premature failure.
I'd recommend you have a discussion with someone in person, maybe a local race shop that does suspension, so they can explain this to you.