There's a few issues to look at here
firstly, whether the question was posted there to be spambait. In this case it seems to be a regular user with questions that don't relate to the product in question.
Secondly, whether there's proper disclosure. I suppose its clearish here, and there's precedent for companies posting support answers as long as affiliation is clear.
Thirdly - there's a precident for someone whose sole purpose here being to shill his product. The questions didn't specifically ask for support for the product in question, and essentially he was posting product recs. In short, the posts should not read like an answer.
Fourthly whether its a quality answer.
It isn't. Its a link only answer. Its low quality. Its no different from copy pasting the same answer to everything. If he had posted a specific, self contained answer, I'd not have seen an issue there.
While SU shouldn't be the main support venue, I don't think an answer being link only and/or posted by a vendor should mean its spam on its own. However, deletion for being low quality makes sense.