The game wasn't dead to begin with so I am not sure what a revival means.
SAS and the BAT mod they make is immensely popular. But I much prefer single play dynamic career oriented campaigns like most people do.
Indeed it wasn't. A very active, dedicated and talented community such as can be found at the SAS forums M4T have updated and modified it to keep it current.
I think the word revival is being used here in the context of "an instance of something becoming popular, active, or important again" to quote Oxford Dictionary definition.
We will never again see the days of sitting watching IL2 Hyperlobby to drop to 999 players so one could join in any sim probably.
Many players disillusioned with 'GB' have drifted back to the older version MP I have witnessed.