That's probably true. The R&G kit pulls the turn signals in a little narrower and a little deeper into the bike, so would have trouble clearing the bags. I put in the ClearAlternatives integrated tail light, which works fine with the R&G kit, so that may solve the problem (can't say for sure as I don't have the Triumph bags).
This is the R&G tail tidy, ClearAlternatives integrated tail light, and a Helmet Guardian with about 1.5" taken out to make the Guardian tuck into the plate.
I do not have to do anything to the turn signals or tail light assembly when I install remove my GIVI/SW-Motech bags/racks.
The R&G kit was very easy to install - just have to come up with a good solution to hide/protect the wires that are currently housed in the mud flap.