For context, this is the post:
It's a legit user who wrote an article that's relevant to the question. And they'd like to share it. There's nothing wrong with that, except that we don't like link-only answers. Hence the comment and the deletion.
This is not spam. It would be spam if the entire participation record of this user consisted of links to their blog, to various articles, only to promote their website. We do get this quite often, but you'll notice it ("Look at my blog for answer!") – often including lots of advertisement and free downloads and whatnot.
It would also be spam if the user tried to sell us a crappy tool (which often coincides with a fake name or location).
If you see a genuine person posting a link to their website, and the answer isn't useful without the link, flag it as "not an answer".
For spam, we'd need to either see the typical spammer's language ("I recommend use SuperRecoverUltra to recover files! It best program and cheap.") or a pattern of very similar answers without disclosure.