Well I'm not a Khovratovich or Dinur or Nadler, but if Khovratovich has been in contact with the two and he says the current fix removes the attack vector, then it's reasonable to believe that.
We also spoke to Marc Bevands who had a lengthy exchange with Alexy and Dmitry. There's a lot of academic and good discussions happening in the background.
Note we are not saying that MTP is not going to be improved upon/developed upon. We do definitely forsee upcoming changes. One of the things we are looking at is also the compression of the proof which is quite large.
However at this point in time, we are still going ahead with rolling MTP on the mainnet unless a significant change is required due to new developments. We may push back the competition deadline a little and introduce a separate bounty fund to encourage scrutiny on MTP.