So, if you're a victim and you don't want to pay ransom

- hire an expert to find out the missing data (timestamp, is it the vulnerable version?, ...), then

- rent a GPU server and keep the fingers crossed.

I've looked for cheap GPU servers yesterday, the cheapest i found was Ultrarender at 200€ per week for a Dual RTX 3080Ti remote workstation. Which is probably overkill, a single RTX 3080Ti can do it in 33 hours or so (assuming the "12 Nvidia GPUs" they mentioned in the article are of similar speed).