Sounds like it's time to wait for the CVR and FDR data... ?
and perhaps some well informed maintenance statements,
Witness statements (albeit often unreliable), might be helpful, and maybe even some video of the final descent?
"Stall" (very unlikely),... "pitot covers" (very unlikely)... "birds" or OEI (still possible, but it doesn't readily fit the data so far to this point),... "inappropriate crew response to a QRH addressed airspeed fault" (very unlikely),...
"STS going the wrong way" (could be a significant)
Further, there are lots of other scenarios still possible, not yet even raised in this thread yet... e.g., involving stabilizer or elevator control issues, ..."speed trim".. damage to the stabilizer leading to a consequent "pitch tuck",...
Dozens more than those could be responsibly posed, far beyond the scope of the above speculation earlier in this thread...
So now,... is it perhaps time to honor the memory of the lost flight crew, give them the benefit of the doubt, support their families, send in a technically qualified team, and wait for some real data???
Crew and Pax... RIP.