I think everyone should be tested daily especially if the NFLPA is coming to them now asking for it. They should jump on it. I suspect that is more of JC Tretter knowing that the players won't go for it, but sees a PR opportunity as well as a chance to play hero to the unvaxxed which some who have spoken publicy have said the vaxxed should be tested daily as well.
It also backs up that the NFL has no reason to not test players daily. If they did it an incentive, it means they were trying to give the players something the players wanted.
I personally expect a prominent vaxxed player to get it and a few weeks in and miss a prime time game or two then it will be daily testing.