Ignoring the quote for a moment, I am going to approach this slightly “worldly” for a moment.
There are like a bizillion comedy shows, commercials and internet videos with guys doing this and getting the arm swing etc…
Men are visual and such but at the same token (prepare the pitchforks and torches) in my experience less attractive people tend to be overly into celebrity crushes etc… idk your situation in any regard to this, and he is still fairly wrong but if one spouse is maintaining their original shape ans the other is in shape because round is a shape…

eh… and whtnot…
However! Based on the piece I quoted I see only two options… either he is a freaking jack butt in this regard (based on your claim he is otherwise “good”)
Or perhaps to give what little defense he could possibly warrant I had my Dad one time help me do something because I sought my parents assistance in saving something I was unable to move without breaking. It was from my dead mother…
My Dad misunderstood the issue and moved it like ripping off a bandaid. And it was ruined, causing a maybe 13yr old to have the face of sad destruction on his face with the expressed “That was my Mom’s I thought you could do it without ruining it”
Well there was a slight moment of horror on my dad’s face as his crushing me crushed him…
So how does he live with himself? Well about six months prior I had messed up and failed a math quarter in school (it was toward the end of summer now)
And he switched from his sad face to re putting me in troubke for having failed math. Because nothing soothes the concious for some like yelling at another.
So your Husband’s verbal assault could be rooted in guilt which could be half a good sign and perhaps some counseling would help?
If not rooted in guilt then idk… this part of the story I quoted is distressing a bit as the intial issue of a half wandering gaze does not sound so horrible but if I were to do so and called out on it I would surely apologize as I know of no justification for such a thing. Tbh as a guy I am not the best at not peeking though also I would not say I stare unceasingly…
So really I would suggest counseling because IMO his looking is not “good” but is much less an issue than the temper tantrum you describe especially if you spend a day or so of negative relations because you got annoyed he looked… that is odd