Hello
I'm sorry to talk english, but I can't speak your language. I just guess what you mean which works quite well most times.
I'm from Germany, but I love Belcar - sadly this is the only place where you can get good and many information about Belcar.
I hope this is OK for you.
I've been at the First Race and saw the remains of the Ferrari of VDV and Grifnée.
For me it looked like KRO lost the rear wing as is was detached from the car but in perfect shape.
Also the skid marks start right at the crest and go to the left.
So this looks like a typical lost rear wing and oversteered crash.
Here are some pictures of the remains. I didn't see the crash itself as we stood on the huge gravel place at the middle of Eau Rouge
[Note the marshall holding the rearwing and the fittings of the rear wing being still intact!