Does Freeze Core also impact full La-group shells?

In the def2_tzvp and def2_tzvp basis inputs, it says 60 core electrons are replaced by -ul potential. I run FREEZE_CORE : True to get the count down to Xe but my Ir_2 calculation returns 18 alpha, 16 beta electrons contributing 9 & 8 each but 54 + 9 + 8 = 71, not 77. Reading the number, 60 + 9 + 8 = 77 means the 6s shell is being treated as core, right? The rest is okay with me if it wants to use occupied f-shells in the calculation to occupy 6s but I want to know that it’s doing it justifiably (I know it uses this occupancy in 6s because orbital 1 is an s-s bond in fchk prints).