Yes, that means no Fusion for you. RT's provide a much stronger downstream signal to those attached, since they're closer than the CO. Sonic's Fusion equipment is only located at the CO, and if they were to attempt to provide you with a signal, it would be much weaker that other signals in the cable bundle serving your block, that it would drowned out and not work for you. This is why Fusion is not offered to anyone located behind an RT (such as myself here in the Almaden area).
Your best bet is to sign up for Sonic conventional DSL, which will be served to you from the RT. That will put you on Sonic's current customer list for your area, which works towards Sonic's planning for fiber deployment.