I strongly doubt it is tachyonic much as Bill S would like it.

QM provides a much more simple and compelling way for it to occur called quantum teleportation and nuetrinos exhibit a weird oscillation that may make it possible.

But before we get all excited and ahead of ourselves we need confirmation of the speed and to do the sort of due diligence checks like Mike brought up.

Tachyonic behaviour should actually be rather easy to detect by comparison because it should exhibit an energy radiation trail which Icarus experiment doesn't see.

I believe in "Evil, Bad, Ungodly fantasy science and maths", so I am undoubtedly wrong to you.