Afaik AI Traffic is never shown on any TCAS system (G100-NXi etc), only custom coded ones like IFT has in the F35. You can also see AI traffic in LittleNavMap.
But not on any of the MSFS FMC Traffic pages, they only seem to show online live traffic.
Posted about that here a while back, and it doesn’t seem changed even in SU15 Beta: Garmin G1000 NXi Issues and Support - #375 by Sonicviz