I have no idea what “all digital” would be unless it’s spitting out individual photons or electrons.
A single IC in this case, actually a single microprocessor generating an RF signal or several. However I am not certain what power levels they would be capable of as the article does not discuss real-world usage examples.
It is one thing to generate defined frequencies for RF usage, but realistically you have to amplify them as well to be able to send and receive them for specific distances.