Ah interesting so perhaps that may explain, assuming there is a rationale behind it, why they left it in the scenario editor but pulled them out of the QB selection. Scenario Designers can still use them for hypothetical creations or other faction mods but TOE authenticity for QB is adhered to with such a revision.
The T-90SAs are definitely still select-able though in QB so who knows
DOH my bad: in the lower panel you can switch to the T-90SA if it gives you the T-72M1 TURMS-T