Still note that many on here still do not understand airbus FBW. Note when not in direct law stick fore & aft movement is a G demand. So I suspect the software interpreted the back stick as a request for x g. So as the aircraft could not produce the x g it tried its best so ran the elevators full up & still not sensing the required g ran the stab full up. (ie followed up)(trimmed is not exactly a correct term)
In theory say a little aft stick requesting say 1,1/4g will end up with full up elevator & full up stab if that is what is required to produce the g demand of 1,1/4 g.
Not relevant here but roll when not in direct law is a roll rate demand so same applies if a small roll demand can not be met full aileron & full roll spoilers could be the result.
I will say however the real aeroplane does have some delay in producing all this.