You mean to be sarcastic, but there's a good chance it may. When I was recovering from my first marriage, during which I was pretty heavily gaslit, having rational, analytical assessments of my wife's behavior by third parties was actually really helpful for me to recover.

His wife has no doubt spent years of her life being gaslit as well, being conditioned to doubt her assessments of what's normal and to feel guilty for suspecting him, for resenting him, for wanting something better. I doubt she'll ever read what I wrote, but there's a non-zero chance it would be helpful to have my take on it.