I finally caught up with Leif and can provide his response:-
AES192 means MPX output over AES at 192 KHz.
BreakawayOne cannot possibly provide AES because BreakawayOne is software. AES3 is a physical digital output format.
However, BreakawayOne provides digital MPX to the sound card. Everything BreakawayOne provides is digital — again, it's software. The sound card may in turn turn it into an analog signal, and then you have an analog MPX signal.
If the sound card, rather than converting to analog, outputs a digital AES3 signal, then what you have is indeed AES192. But, BreakawayOne has no idea that that's what it's doing.