Homepod Death Fart Update
I can confirm that despite a lot of on the off-chance hoping that iOS15 does not make the slightest bit of difference to this issue. My 16 month old Homepod still farts like my dad the morning after a big night out.
Turning off Siri may have reduced the instances of the farts, but it doesn't eliminate them. Told by Apple Support to book it in to a genius bar but also told that it's out of warranty and so... well.. You know the rest.
Who is in the same boat here?