So how could they confirm the "mobility kill"? did the 262 stick around to check if anyone bailed out, or did he make a pass and get the hell out, did he hit the tank, compare the tank claims in Normandy to the real toll on vehicles and it all gets a bit doubtful.
These kind of anecdotes really are dubious and likely just that, anecdotes.
If the tank was on fire or smoking, that was an indication.
A British video of a single 30mm MK 103 mine shell test hit in a Spitfire wing at around the flap/aileron junctions shows the following effect:
The flap is blown off, the rear spar severed and a man sized hole has ripped up all the way to the main spar. In flight the wing would have failed.
A picture of a test against a Blenheim tail shows the tail blown open like a split watermelon to twice its size.
The concussive effects in the cooling intakes of a tank sure must have been signifcant and I can well imagine radiators split, fuel lines ripped, cooling lines destroyed.
The damage was likely repairable but the tank was stopped and that was often all that was needed.
Modern 'fragmentation' round often contain exotic technologies such as tungsten cubes.
Tank kill claims are likely exaggerations or really just mobility kills. The tank kill stats at Normandy show that getting a hit with a rocket was rare, very rare in combat but one can imagine the MK 108 being considerably more accurate and yet despite is low lethality if it did succeed in a hit since it was likely it could gain more hits it may have been quite effective if fired at the rear deck. It may have been more effective against thin skinned armoured vehicles such as half tracks than a rocket.
If used against thin skinned vehicles such as transports, tankers and repair vehicles the Mk 108 may have been an effective ground attack weapon. They were used to strafe and I have read of accounts of jeeps being attacked.