FWIW, Dilfer defended the Pats post-Deflategate more than probably any other former player. He openly called out Ray Lewis on the air, pointedly telling him that the 2000 Ravens SB team was engaging in a whole lot of stuff that was worse than footballs being a fraction of a PSI light.
I don't like him as an announcer, but not because of a lack of knowledge. The guy was a notorious workaholic even by NFL QB standards. He just had virtually no talent. His physical gifts sucked, and he couldn't process the entire field in a fraction of a second like the great pocket passers can.
Similarly, I don't like him as an announcer because he seems to feel compelled to overexplain and/or oversell everything. His knowledge is on point though, I really liked where he dissected Kaepernick's improvement as a pocket passer earlier. If he could learn to be more selective about that, plus stop trying to oversell mundane moments in ****ty games, I think he would be a good announcer.
Basically, I think he's running into the same block as an announcer as he did as a player: he has no natural feel or talent for what he's doing. Which is a shame, because he's clearly put in the research and knows what he's talking about.