That's not particularly fast for your average stroll around the internet, but according to the paper 1,000bps would enable real-time keylogging, could transmit an entire 4096-bit RSA key in a little more than four seconds, and could steal private cryptocurrency keys in a quarter of a second.
If you already can run malware on the target machine to manipulate power draw and you can get close enough, then I would imagine you could get the key out by other means for more easily. If the machine really is air-gapped so no internet, then its private RSA key is not terribly useful to outsiders?!
So quite an interesting achievement, but I'm not sure how much sleep anyone needs to lose over it.