My information probably is limited to WW2 & Cold War. I think your correct. Haven’t read or heard of a Russian colonel-general since soviet days.
To this commenter, the Navy’s Officer rank structure
Navy, Coasties:
O-10:Fleet Admiral
O-10:Admiral
O-9: Vice-Admiral
O-8: Rear Admiral
O-7: Rear Admiral Lower Half
O-6: Captain
O-5: Commander (Full Bird)
O-4: Lieutenant Commander
O-3: Lieutenant
O-2: Lieutenant Junior Grade
O-1: Ensign
Was more straightforward and easy to remember than the Army’s:
Army, Air Force, Marines:
O-11:General of the Army
O-10:General
O-9: Lieutenant General
O-8: Major General
O-7: Brigadier General
O-6: Colonel (Full Bird)
O-5: Lieutenant Colonel
O-4: Major
O-3: Captain
O-2: 1st Lieutenant
O-1: 2nd Lieutenant
and, the fact that full birds in the Navy were of lower rank than full birds in the Army was just overall confusing.
The Russians seem to have only four flag officer ranks, at least in the Army, and not five flag officer ranks as in the U.S. Army and the U.S. Navy.