I initially was thinking about the Bournemouth incident also but as someone else said there does not seem to be a low speed event (from the data that has been posted).
If the leaked CVR transcript is accurate and there are shouts of Pull we don't know if it's because of a stall situation or the aircraft being in an nose down situation and still "flying".
Someone said it appears to have got to (perhaps) the MCP altitiute okay, then suddenly it all changes, this could be that it got there okay as one would expect, or it got there converting forward energy converted into vertical climb rate and then stalled (data so far doesn't seem to suggest that).
So left wondering what would cause rapid descent
Stall
Uncommanded nose down
Fight control problem
I wonder if during the go around if the a/p was engaged and because of the crazy rate of climb the A/P shoved in loads of fwd trim to try and reduce the climb rate, or the pilots did.
Then once the thrust came off reaching altitude they are now left without the pitch couple to the thrust and aircraft nose naturally comes down, but the stab is now fully forward also, with very little Sky available to try and resolve it ?