Unions don’t fight overtime rates. That’s almost certainly a concession management demanded to avoid stacked overtime.

Case in point: several years ago when I was an SA we were having some sort of big piece of Verizon equipment in our office due to our bandwidth and phone demands. The guy was coming from Philly (to upstate ny) and was on his 10th consecutive day, on a Sunday, on a holiday weekend at like 3 AM and a forced double shift. I think he said he was on something like 10x overtime.

Even paying that kind of ridiculous OT was preferred by them vs hiring more CWA guys. CWA is/was a stronger union that would strike over that kind of cap.