It is supposed to be yes, but some Airplay 2 devices don’t work with Roon (for reasons best known to Roon). The Muso has an optical input, so you could use a £30 Chromecast audio as a workaround until Roon deliver Airplay 2 compatibility (no release date for this has been given).
However, some people seem to have got it working according to some threads around when it was released.