Vincent de Phily
AFAIK we don't have a way to tag the absence of housenumber (https://wiki.openstreetmap.org/wiki/Key:addr). Countryside houses are more likely to have a housename, that may shut up StreetComplete.

There's no point in keeping a note open for this, you'll get used to the fact that QA tools have false positives. Some (like osmose) have a way to mark them as such, but I don't think that StreetComplete does.