Yes, Izd. 30 is from NPO saturn. MMPP Salut and NPO Saturn are different. Kinda like KnAAPO and IAPO. There are 2 hypothesis about the stealth TVC nozzle shown in Russia -
1: The nozzle is NOT destined for the Su-57 and maybe purely targeted to the Chinese market or for export in general.
2: NPO Saturn subcontracted nozzle development to MMPP Salut since they already had all-aspect 3D-TVC tech.
There is no tech corporation between CAC and Saturn whatsoever. Salut is CACs trusted vender. Salut had that all-aspect 3D-TVC technology for sometime now. Even if Saturn has subcontracted Salut for the new nozzle, CAC would have acquired tech from Salut long before that. CAC and Salut connection runs deep.