Arbitration does not and cannot cover crimes. Arbitration is a civil matter. I would imagine that the arbitration agreement included a clause along the lines of "Alphabet will not pursue any further legal claims against Levandowski related to his time of employment." and vice versa.
I could be wrong, of course, but I doubt arbitration left open a lot of space for future action. Without the arbitration being unsealed, though, I have no way of knowing.
Of course, the US DoJ and/or California equivalents can still pursue criminal charges against Levandowski.
> “Waymo asserts no claims for trade secret misappropriation in those arbitrations."
That article describes the arbitration being about poaching/non-compete agreement violations.
If they didn't raise the trade secret theft allegations, are they allowed to come back for another try? Or did they miss their opportunity?