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It depends what you mean by "general purpose." First, these things generalize more often than you'd expect. Second, even in the absence of generalization they're still useful for, e.g., fingerprinting activities to manufacture a unique ID where non previously existed.

The paper isn’t describing a unique ID fingerprint. It’s looking for specific activity patterns to match against training data of running specific commands on specific hardware.

Publish or perish. It worked once, in a controlled lab, mostly (80-90% guess). Good enough for more millions in funding..

Not really joking here.

https://hannesweissteiner.com/

https://hannesweissteiner.com/publications/frost/

That's basically just a research, theoretical attack vector. It doesn't mean it's viable for general purpose old school mass privacy invasion