There is no evidence for any of the the claims being made. Unless we see a criminal investigation and charges this is nothing more than pr.

Musk does sound a bit like a paranoid crack head but the pr gambit is to distract from the recent string of tesla crashes and spontaneous combustions by floating the idea of sabotage.

Of course they cant directly allege sabotage because it is absurd but if you put the idea out there then people infer it.