According to this post, the differences can be explained by differences in the testing baseline (point 5):
Also sorta weak that this is the only publication that has done anything about it. If this was a real issue, surely some journalists would have picked it up by now, considering any Apple scandal makes headlines for weeks.
It just doesn’t seem to hold any water.
Rtings is in the business of reviewing and testing A/V equipment. Other publications,
including MacRumors, picked up the story at the time. But most don’t have the in-house expertise and equipment to do the testing the Rtings did. It got plenty of attention at the time that it was news. It’s simply old news nowadays.
Not to mention, with Apple’s automatic updates for AirPods it’s quite difficult to get a hold of AirPods with older firmwares and keep them that way since they have a propensity to auto-update as soon as they are able to. This is part of the reason the complaints died down. Apple released the 2C54 firmware a mere month and a half after the initial launch. Anybody who bought AirPods Pro after that firmware update was released would’ve been silently, automatically updated and lost the better ANC soon after pairing them to a device. Most people who owned first generation AirPods Pros never even got to experience that firmware and how good the ANC was because the AirPods would have self-updated within minutes or hours of being unboxed and set up. And eventually, Apple just started shipping with newer firmware pre-installed, so you’d never have the chance to hear the good ANC even one time.
The debris/earwax/oils affecting the microphones isn’t the cause — or at least the entire cause — of the issue either. I got a pair of replacements under the Apple service program, and those ones brand new out of the box did not restore the original ANC because they were shipped with a newer, already-neutered firmware. I can tell you first-hand with my launch day AirPods Pro that the difference was noticeable. My spouse also tried the original launch day ones the day I got them. After trying the replacement ones more recently, they also noticed the significant reduction even though I said nothing about it. It was clearly noticeable without any bias or predisposition toward believing something has been changed.
People who never had launch day AirPods Pros have been doubting this reality since the day it was first reported. I had them, I experienced it, and there’s no reason to doubt anybody else who did. Rtings’ testing simply reaffirms what we all experienced first-hand. I just don’t understand why anyone continues to blindly come out to Apple’s unsolicited defense over the issue when even Apple themselves have never denied that they mucked with the ANC.
I’m far more likely to believe the thousands of launch day AirPods Pro owners who had the same experience I did over a company that only a couple years prior tried to cover up secretly slowing phones down when their batteries aged, rather than being upfront and admitting that they were doing this and why it was necessary to manage the limitations and lifespan of a component that naturally degrades with time and use. It’s far more believable that Apple secretly neutered ANC and refuses to admit it regardless of the reason: planned obsolescence, potential damage to the drivers, complaints about headaches and dizziness, or patent infringement avoidance.