Yes, this is the default config of Flightaware’s latest dump1090 package. 30104 is a generic Beast-format input port, you can give it things other than mlat.
piaware itself listens on no ports. It connects to piaware.flightaware.com:1200 for feeding data, localhost:30005 for receiving data, and by default it connects to localhost:30104 for returning mlat results. Also, outbound UDP to a port in the range 4999…9999 on whichever FlightAware host it connects to.