Israeli media reports that Iran lost its entire military command and Khamenei doesn't know the new commanders is hilarious propaganda
IRGC has an army of commanders with experience in top positions over the past 20 years. they are constantly being rotated across different positions and Khamenei obviously knows them all.
Safavi, Ali Jafari, Pakpour, Ali Fadavi, Ali Ahmadian, Mousavi, Tangsiri, Izadi, Vahidi, Rezaee, ... then there is Artesh commanders too which basically have not been affected at all.
the depth of IRGC commanders is huge. even 5 of the last 6 IRGC commanders since 1997 are still alive! only Salami was killed (at 65 years old).