Well for Supercharger V3 in North America they kept the same plug/inlet format. And that currently tops out at about 250kW.
So the Mennekes Type 2 could have handled it as well but Tesla decided to go with CCS, probably because it opened up more charging options for Model 3 owners without much more effort on Tesla's part. (And no adapter purchase on the part of the Model 3 owners.)
The difference is that if they did that in NA they would have had a problem with all the destination chargers, so it wasn't an easy option here.
I sure hope you are right and that the mennekes 2 from Tesla can handle the 250kW.
I’m also believing that the chemistry of the 18650 has been changed, certainly in the 100.
Now remains the question: why is Tesla delaying the definitive announcement for S and X