I have a baro module for my Stratux, but the last time I tried it (early v9.6 betas), iFly did not make use of it to display corrected differential altitudes for Traffic.
I don't recall seeing that feature mentioned in the notes. I could try it again with my Stratux the next time I'm at the hangar. But I'm wondering for now if iFly makes use of any ADS-B receiver's baro output for Traffic?