I liked that too LOL
That's fairly hard to swallow.
Unlikely - and also from Aerospaceweb...
Also important to note are the findings of Willy Messerschmitt who had designed the Me 262. Messerschmitt conducted a detailed series of wind tunnel and flight tests to determine the maximum speed his creation could achieve. Flight tests included a series of dives similar to that experienced by Hans Mutke. Messerschmitt concluded that the Me 262 could not exceed Mach 0.86 without becoming completely uncontrollable. Any higher Mach number would generate a nose-down pitch so strong that the pilot would not be able to overcome it. This pitch would constantly increase the plane's dive angle to the point that the aircraft would disintegrate under the negative g-loads. The Royal Aircraft Establishment in the United Kingdom later confirmed these findings during Britain's evaluation of the Me 262 after the war. The RAE found that the maximum safe speed that could be attained was Mach 0.84, and any higher speed would result in a fatal, uncontrollable dive from which recovery was not possible.
In light of this information, it seems very unlikely that Hans Mutke broke the sound barrier in 1945 while flying the Me 262. If he had, he would not have lived to tell the tale. Mutke probably reached speeds closer to Mach 0.85. It seems probable that he experienced the sudden changes in flight characteristics that often occur in transonic flight and believed he had flown faster than was actually possible.