I would interpret the data as agreeing, not denying, that digital currencies are used in crime. I don't believe that was being debated.
The open question is whether legitimate uses of digital currencies outweigh their illegitimate uses. The supplied data, which you're welcome to rebut, strongly suggests they do.
More to the point, the data suggests that GP's simple solution to stopping ransomware crime -- banning an entire class of media of exchange -- won't be effective. Not only has ransomware existed at least since the 1980s, well before the 2009 introduction of Bitcoin, but it isn't even dependent on digital currencies. (My personal and anecdotal intersection with it shows 0% usage; one in the 1990s demanded a mailed money order, and the other in 2023 provided a phone number to call and read gift-card scratch-off codes.)
Banning money doesn't stop crime.