[edNorth]

No smoke without fire is the saying - maybe not appliable here.
But misunderstanding can change things quite much (usually further away from truth).

My two Pfennig; Maybe the 24th (total) victory (credit) by NSFK, not his personal score - early 1945 trained pilots were in short supply, and he may have just happened flying two seater on test or ferry flight ??? - but is Allied report (of the type doing the shootdown) 100% correct.

I mean, just last week I found in specific RAF ORB, two crews on two different aircraft (but with same co-pilot and navigator) flying the same mission (flight) in two different aircraft, over same span of several days, but with exactly same t/o and arrival times.
One can however read these have "entered date" (in ORB) five days apart (so two flights!)

He already had single engine (Bf 109 et al) category, could he not already have twin rating too (from days before the war)? Were there Twin-Turbine taxi, or engine start, or armament-trainers (?) - I have seen such on Me 262: fitted with FO(D) screens, or was this (reported) dispersed location to hide a few trainers from marauding fighters.

Some grass fields were exceptionally long, but grass surface usually add 25% to the take off distance. Hard runways attracted bombers and other attack planes.