Correct. Per FB CGII Initial Scenario Special Rule II.9 only "?" markers may be purchased using the initial 20 FPP.
"II.9 The only “Fortifications” the Russians may purchase are additional
“?”. No field phone may be selected by the Russians. No Russian RG
may be purchased as “On-map” or “Reserve” (17.6194)."
In the initial scenario of CG2, the marauding Russians are given 20FPP, but are only allowed to purchase '?'. Are these FPP really there only to give the attacking Russians dummy stacks?