You can actually provide a corrected version to Siri by pressing the little "Tap to edit" under the transcript! I'm not sure if the correction ever get sent to Apple (maybe it's on-device training), but I've found after a while Siri accuracy improved a lot, e.g. no longer interpret "Log" as "Lock" when I said it.
Is there a way to do that for HomePod?
E.g. Wanting to “help Siri get better” shouldn’t have to be an all-or-nothing opt-in. Though obviously individual posts are also probably less likely to be sent.
Or maybe simply sending the local model updates would be sufficient to improve things globally?