It is not accurate that the IRGC confirmed losing "hundreds" of personnel in recent days. However, Iranian state media has reported the deaths of over 100 security personnel, including IRGC members, amid ongoing nationwide protests, and human rights groups report much higher overall death tolls.
https://www.google.com/search?client=firefox-b-1-d&q=IRGC+Confirm+They+Have+Lost+HUNDREDS+of+Personnel+In+Recent+Days