This is the only accident I could find that is remotely similar;
https://aviation-safety.net/wikibase/310048
However it seems once the parachute failed and detached the aircraft then accelerated to very high speed as you would expect from such nose down attitude.
Was the pilot a student perhaps , fresh gfpt on a fun flight , could be trying to have fun around clouds for the kids?
Experienced pilot with hundreds of hours is what is quoted by the media.