That is also my understanding. 5.1 plus zone 2 or 7.1 and no zone 2. Some of the denons do have extra speaker connections so you can run two pairs of rear speakers and switch between 7.1 and multizone, but AFAIK none of them will let you run 6.1/7.1 and multizone at the same time.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8