The difficult thing with this sort of article is that while it generally sounds plausible, the layperson reader doesn't know about the specifics. I don't know anything about BFO spoofing or handshake rings. This means that all I can really judge this article on is its presentation and logical reasoning, and while both seem okay, there's no way for me to evaluate the premises and finer points that the piece critically…
I started reading this and then I thought of Occam's Razor. This theory is appears way too complex to be true, something much simpler likely happened.
Edit: a very simple example: look at magic tricks. If Occam's Razor was true, then all magic tricks should imply that those who perform them are actually magicians. Or, we all know it's not the case, so there is indeed a more complicated trick being performed that is difficult to uncover just by looking at things.