This won't be the first time a 210 has flown in one end of some bad Wx and come out the other side without a wing or two...
VH-WBZ
https://www.atsb.gov.au/publications...-2011-160.aspx
I am by no means saying this is the case in this situation, but looking at the rain on the ground and the BoM information at the time, it certainly doesn't seem beyond the realms of possibility or probability. Regardless of how, still a tough outcome for all concerned...