I think (as a non-member of the mathoverflow community, I just flag spam here) that the spam flag fits perfectly.

[e]xists only to promote a product or service, does not disclose the
author's affiliation.

The product in question is the article. The author (or someone else who likes him) has been spamming this article over 30 times so far. (Thats just the records we have).

This search produces 32 results, all mentioning this "Thierno M. Sow" and his article, and all of them exist only to promote it.

I'm not a mathematician, in fact I'm not very good at math at all (compared to mathematicians), but the larger community (irrespective of the spam) seems to consider the "Proof" that Thierno M. Sow claims to have obtained very dubious at best. A google search reveals that he is not even publishing the article for free, but charging 27$ for a copy.

The blog post criticizing Thierno also makes some further points:

I was tipped off about this by a reporter at our local newspaper: a
local man, James P. Moore, is apparently claiming a solution to the
twin-prime problem and the Goldbach conjecture. I haven't read his
work. However, the manner in which the claim is being made raises real
questions about its correctness.

Moore is apparently not a mathematician by training. Here it is stated
that he has a systems design engineering degree from Waterloo.

According to MathSciNet, the database that attempts to review every
mathematical publication of interest, Moore has not published any
mathematical papers, at least under the names "James P. Moore" or "J.
P. Moore". The chances that an amateur without previous mathematical
publications could solve these important and famous problems are, for
all practical purposes, zero. (Prior to his celebrated recent success
on the twin-prime problem, Yitang Zhang, a professional mathematician,
had two published papers in good journals.)

Instead of placing his claimed solution on the arxiv, or publishing it
in a journal -- as would be customary in such a case -- Moore is
selling his solutions online in three different books for $27.05 each.
One book is entitled either "The Proof of the Primes" or "The Proof of
Primes", a title that doesn't make much sense mathematically.
(source)

So I think it's safe to assume that "spam" fits here, as it's promoting a product (the article / book) that the creator stands to profit from.

at all. What we can do is blacklist certain terms or usernames, which lets us find it quicker when he does post here, and then flag it as spam. $\endgroup$ – ArtOfCode Jan 30 '17 at 15:50blockposts, then it would be a whole different story. $\endgroup$ – Todd Trimble♦ Jan 30 '17 at 18:20