A quick explanation might be gaijin’s method of dealing with OP SPAA - moving them up in BR. We’re seeing this live with the Coelian, which got its absurd APHE buff and was “fixed” by moving it up to a higher BR (which is actually more of a buff as 7.0 starts seeing lighter pre-MBT vehicles). Add this onto the “French tax”, which is a popular coping mechanism involving France players apparently being so good all their vehicles are at least 1 BR step higher than they should usually be, and you have your answer.
Realistically? I think gaijin saw a full belt of APDS and decided to move it up, as they do like to focus on a particular aspect of a vehicle as justification rather than considering its all-around capabilities. The stabiliser doesn’t matter all too much given that with how slow you are sometimes, the traverse essentially serves that purpose.
The AMX has always been pretty overtiered, especially considering how bad the radar is. The itPSV, Gepard, XM246, etc are all leagues better at lower or equal BRs, being stabilised 35mm death machines that can fire the “funny” APHE rounds to one tap even heavy tanks, which gaijin decided to fix this update by removing 30mm APDS.
Essentially, gaijin decided 30mm APDS was the problem and not the unrealistic/unexplainable amount of both penetration and explosive filler 35mm (and 30mm) SPAA all get, which is why they’re so good at TD work.
VEAK 40 exists at 7.7. I think both Falcon and DCA will be heading down in BR. You have ZA-35 at 8.7 without APDS, but that has mobility that the DCA could only dream of.
The biggest BR drop I could think of gaijin allowing the DCA is to 8.3, where it’ll still be outperformed by anything with a working radar.
Honestly, this “fix” changes nothing, as it only affects the vast minority of SPAA, and not even the root cause, leaving the overperforming APHE like it’s fine