Or he says he tracked a scumpartner, who lies to cover up for him. In fact, if he's lying scum, that's exactly what he does to get away with this claim. "I tracked my partner, who targeted player B." Partner confirms, now Player B looks like a town PR.
But surely this unravels very quickly if we lynch one of them?
IF we lynch one of them. Say someone most people feel is towny is that partner. And Morgrim comes in tomorrow and says:
"I tracked Voltaire last night. He targeted no one."
Voltaire (just chose someone randomly) comes in and says, "yep, didn't target anyone."
Are you going to press for a Morg or Volt lynch at that point? On what basis? On the "well, ashersky thought this might happen on D1" argument? That won't fly. I mean, either Volt really didn't target anyone, or he's Morgrim's partner, or both.
A better argument would be to say that the real Tracker could counterclaim on D2 or D3 or whatever, leaving the liar alive while the real one tracks others to try to catch a partner. But I assume a fakeclaiming scum would also do the night kill to insulate his partners as much as possible.
I think the only thing off the table in my mind is Morgrim being the Traitor. Unless he's trying to get his scumpartners to kill him, he's not fakeclaiming like that.