To end the T1 bomber crap, bombers lost radar, became more expensive, hoverbomb was made a LOT harder, and T1 AA was changed in balance (HP boost and attack boost).
Now one of those things has been changed. If it even is a nerf, it's a minimal one. The reduction in damage is 10-20%. The mass reduction is 9%. Two AA are still less expensive than one bomber and a simple test I did showed that a UEF bomber will only survive against a Cybran mobile AA, if that AA is standing still. In all other cases it dies after one pass, which means that some AA will survive (all if they move).
So a bomber is still hard countered by T1 AA and can still not dominate against a land army. Using bombers for one pass is still useful in some cases, but this doesn't become a viable option until you have multiple bombers to kill larger sections of a land army.
This particular change is fine.