Wolff bought stocks, and then a few months later Daimler increased their investment into Aston Martin and brought a new CEO in, which massively increased the worth of those shares Toto bought. Combine this with him being best buds with Lawrence and how this whole Merc/Aston Martin relationship was already last year (this time in F1) under investigation for suspected illegal sharing of CAD designs and I would say that the likehood of him being guilty is high, but there is no way that he can be proven guilty.
Wolff is classic finance guy working in probably the most ruthless sport in the world, I would be zero surprised.