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The point PW is that the AAV will not let foul gases out not that its faulty. The point of a soils stack is to let air both in AND out. If its blocked by a poxy AAV then it WILL come out elsewhere. End of.
If this were my place, then I'd simply take the thing off first. If the problem goes away then get the builder back to repipe it properly to 1m above the nearest opening window as the regs say. AAVs are a rubbish builders bodge.
Yes they're not meant to let foul gases out, but they can if faulty but its a moot point here. Agree with you that they're a crap bodge with potential to cause a lot of headache solely so the builder can avoid doing fitting the soil stack properly.
If the AAV is blocking it and its letting foul air out elsewhere isn't this potentially indicating an issue with the soil stack, i.e. if it can less gases out within the house it could also let waste water seep out? Suppose its prob more likely that the foul air is being forced through water traps due to pressure probs if blocked by aav.