If you bought a new car and it made a squeaking sound when you used the aircon would you just live with it, still working but an added squeak?
It went to the service centre with a noise fault so you would assume they would not look for such a fault in a noisy environment
That's not the same thing at all. If i am going to take a stand on the Sony's perspective.
1 - perception of noise level
2 - the environment of the test is different to your home. And the car, you would be sitting inside, and there is only 1 place you can sit therefore the variable is practically the same for both.
3 - It's not a fault, the PS5 works on all the metric in their tests. a fan that makes 2db louder than another is not a fault. It still play games just fan. It doesn't crash, it's not overheating. All the metric, and they would have them, it passes all their tests and tolerances. If they have a noise level, it passes that too. It might not be to your liking but it has not failed.
As for "It went to the service centre with a noise fault so you would assume they would not look for such a fault in a noisy environment"
You think they will build a sound proof room for this? or do you think they have a room for every fault.
Like a dark room to test the brightness of the LED, a zero noise room for fan noise. Or would you think it's just your run of the mill electronic workshop with people around, perhaps even a background radio playing?
Look, I am not saying that fan isn't making a noise, but it also doesn't cross the line of being faulty to me, and not to them either.