Yep, I agree with the article.
I'm on an iphone8 iOS14.2 with the AirPods Pro and there has definitely been a change in the noise cancelling effectiveness for the worse. I used my Pods to reduce road traffic noise on a run etc (even in the house or at work) and was impressed initially but this update has to my ears quite severely reduced the noise cancelling capability. To summarize - I am no longer impressed by apples noise cancelling on this product - i hope they sort it out in the next iOS upgrade!! grrr, very annoyed!!!
Is it the upgrade ? well timing for me would suggest this but apple are suggesting something else...
I see on apple . com that it's possible (restrictions allowing) to bring them in for a repair...
see
Follow these steps.
support.apple.com