No worries, nemesis. Like I said, I've never in my studies come across Muons as being Tachyon candidates. Who knows who or why the publication stated that... it's entirely possible that he did in like the margin of his notes and some encyclopedia "ran with it"... or that publication could have made it up!

But in summary, none of the elementary particles, including the elusive neutrino, have ever been Tachyon candidates. By their very detectability they are not candidates, not to mention mass.