@RYFQB
If you take recent accidents as an example you would expect fpm in the range of 6,000 to 13,000 fpm. With 9,000-10,000 fpm as the more likely ones.
In this case the vertical speed appears (just my first impression, no more) to have been less than in the AirAsia case. But without having any specific data you could start with a 9,500 fpm estimate.
When you look at the numbers and go over 20,000 fpm and even an order of magnitude higher ... then you know that it is highly unlikely that these numbers are correct.
Try to find a solution ... that's what random dudes do ...