I raised a spam flag on an answer, that doesn't answer the question, but it's tying to sell a product.
I now realized that the product in question is mentioned in another answer and the author of the flagged answer is the maker if it, trying to reply to OP's comment, inquiring about the product.
The proper flag should probably have been just a NAA, but the mod should have still deleted it as a non-answer.
I assume there was a mistake by a mod, because the message refers to the Gerben's comment linking to the product.
Should I have just flagged this post as NAA or is this post still considered spam?