Yeah this information is authentic.
The release date has been announced on the TMP Official Twitch stream by James (TMP Staff).
And coming to the other topic, buses will be available in the servers already exist (Sim1, SGP, arcade). You can even drive buses in Promods but there is no information about whether you can do jobs using buses in promods. But it will be available in promods pretty soon, atleast i hope so.