Garmin Messenger App on Epix Pro

I know it is early days, but I don’t see anything online about this. I’m guessing it is simply allowing my watch, like my phone, to connect with an InReach device?

…or, could it be that an Epix Pro can now act AS a satellite-connected device for Messenger use? I.e. since I already paid good money for a satellite connected gadget, now all I need is a subscription…but don’t need to buy an InReach device!??!