Don Johnstone wrote:

It is to be
hoped that some of the above passage is the result
of iffy translation, if not it is a very strange sequence
of events.

Perfectly correct translation. No strange sequence at all.

The report conclusions do not help. I am no expert

Yes, they do. Know your airplane, know the emergency procedures and
particlarly know its behaviour in regading to spins. Practice spin
recoveries, practice spiral dive recoveries. And any pilot who is even
tempted to pull back the stick in a spin is not airworthy.

on the 4DM but is it possible to exceed VNe in a spin?

Certainly not. But many gliders will not stay in the spin but go into a
spiral dive. Which was obviously the case here.

Stefan