Not that this isn’t scummy but my understanding is that “ransomware” refers to software that locks a user or organization out of their systems until a fee is paid, generally my encrypting the disk.
This seems like a more traditional “hack” of a system where you get in and download data. Which makes threatening them is traditional blackmail.
The point is that Alphv is an operator of ransomware as a service (RaaS), specifically BlackCat, independent of whether they used ransomware in this specific attack (which it indeed doesn’t sound like).
I’ll have more respect if it were done by disgruntled employees, but this blackmail is done by a ransomware operator.