When antibiotics are used to kill them, dying viruses release toxins in the blood that begin to multiply quickly
What is this I don't even...?
No part of that phrase makes any sense.
And the headline hypes Magnets!, which is bound to inspire yet another round of Magnet!-therapy scams (possibly now with added Nano!-). Near as I can tell, the magnets come in at the end of the process; the real trick is to get some magnetophilic** molecule to bind to the nasties so that they can then be removed.
I assume the original (paywalled) paper makes more sense, and it's the popularization that got mangled.
* Not, apparently, any sort of Irritable Bowel Thing.
** I don't know offhand what the applicable term is, so I made one up. You can do that in English, the Language of Choice for Lazy People.