Nothing really new there, RF and power attacks have been a thing since at least the 1960s (When we were doing it to to the Soviet Embassy crypto suite, and they were returning the favour). Monitoring the current consumption to extract the plaintext right from the teleprinter was very much a thing.
They are rather over stating the case for some of it, but what do you expect of a media piece about embedded hacking? Printers have been low hanging fruit for a long time, postscript being what it is, and VIOP is the original Internet of Shit application, no surprise that some phones are exploitable.
Now pulling it off in a office you control is a very different trick to pulling it off on an unknown network in some corp that you don't control, that is the sort of thing that takes multiple exploratory attacks to map out the system before you can run something like an attack on the phone system and hope to exfiltrate the data in a useful way (In other words it takes some real effort).
Regards, Dan.