You are basing all of your claims that the ANC is not as good as it was on release day on what you *read * about the early days?
That’s called hearsay. And there’s a reason courts don’t usually allow it as evidence in a trial: it’s unreliable.
Also someone who's had the Airpods Pro since day one I can tell you that ANC is definitely worse now than it was when I first purchased them. For a while I was getting issues sealing no matter which size ear tip I used, I could hear low rumbling and the ear tip fit test was say to adjust or try another tip every time.
Then, I installed memory foam underneath the ear tips and that has drastically improved the fit, but at the same time I can hear only a minor difference between the "Off" setting and "Noise Cancellation" setting.
All of this is to say that I believe that there is an issue with the ear tips for some people that makes getting a good seal difficult, as well as an issue with the firmware that has degraded the ANC since the original firmware.