But, as I said, the much more likely scenario for something that is more modern than an PG-7 is the Kornet. Outside of that...perhaps the RPG-7 made a good hit, particularly if the shot came down from above.
The gun you are referring to is pretty big.
...the secret is the design of the penetrator and the propellant.
Sir Isaac is NOT mocked, despite your fervent wishes. Anything with enough foot-poundage to reliably punch through that much Chobham armor and inflict significant damage to the interior of the vehicle, using only kinetic energy, is going to have one hellacious recoil. The only way to damp said recoil to tolerable levels is to have some sort of recoil mechanism, which in turn drives up the total mass of the weapons system.
But, as I said, the much more likely scenario for something that is more modern than an PG-7 is the Kornet. Outside of that...perhaps the RPG-7 made a good hit, particularly if the shot came down from above.
Kornet is unlikely. Kindly look at your typical city block. Getting 100m of unobstructed LOS is rather difficult, particularly if you are trying to fire from a position of concealment.
My guess: an RPG-7 shooter got extremely lucky.
Insurgents in Iraq and Afghanistan routinely fire RPG's at high elevation angles so that they come down and explode like mortar rounds. By luck or by design, the 4.5 second timer on the RPG round kicks off just as gravity has pulled the round back down to Earth when fired thusly.