As far as I can understand it, the training would - at best - have done nothing, since Lion Air only wanted a brief familiarization session in the simulator that wouldn't have covered anything so exotic as MCAS failure, and all the things it would've covered were almost exactly the same. That's a best case scenario. The MAX-specific simulator was apparently having such bad initial problems that Boeing staff griped internally that they wouldn't trust their family to pilots trained in it.