This paper is claiming that they have. If neutrinos move faster than light, then by definition they are tachyons. Nobody has come out and said "we have verifie

This paper is claiming that they have. If neutrinos move faster than light, then by definition they are tachyons. Nobody has come out and said "we have verified the existence of tachyons, and neutrinos might be some of them". Rather, the claim that neutrinos move faster than light is the claim of verifying tachyons. Incidentally, in this case the claim seems a bit more roundabout: that neutrinos may have imaginary mass, a different but equally-well-defining feature of tachyons, and thus they can move faster than light.