If his words should be taken gospel, and the 90% rest of the 109 pilots knowledge means nothing, then yes
Well, of course I like the BF 109 best, however, we lose credibility when we claim the 109 had better range than the Mustang, could dive better than a P-47 and turn better than the Spitfire.

With regard to your 90% figure, ok I'll bite
Gerhard Schöpfel
the British fighters could turn tighter than we could
Heinz Knoke said of Spitfires:
The bastards can make such infernally tight turns; there seems to be no way of nailing them.
Werner Mölders:
The Spitfire was "faultless in the turn"
Adolf Galland: "the ME-109 was superior in the attack and not so suitable for purely defensive purposes as the Spitfire, which although a little slower, was much more manueuverable"
Johannes Steinhoff
At 28,000 feet the Spitfire could turn in an astonishingly narrow radius. We on the other hand, in the thin air of those altitudes had to carry out every maneuver with caution and at full power so as not to lose control
Erwin Leykauf
I myself had many dogfights with Spitfires and I could always out-turn them. One had to enter the turn correctly, then open up the engine. It was a matter of feel. When one noticed the speed becoming critical - the aircraft vibrated - one had to ease up a bit, then pull back again, so that in plan the best turn would have looked like an egg or a horizontal ellipse rather than a circle.
Walter Wolfrum
"Unexperienced pilots hesitated to turn tight, bacause the plane shook violently when the slats deployed. I realised, though, that because of the slats the plane's stalling characteristics were much better than in comparable Allied planes that I got to fly. Even though you may doubt it, I knew the Bf109 could manouver better in turnfight than LaGG, Yak or even Spitfire."
In this sample, one could argue that 5 of 7 or 71% of German pilots thought the Spitfire could out-turn BF 109. Leykauf was talking more tactics than sustained turn, but we'll count it

I thought Walter Wolfrum just flew East Front?
If we add some readily available British accounts (yes I know they are all dishonest liers

, although there may be some commonwealth types there as well):
Colin Gray
there was no way a 109 could turn inside a Spitfire
Hap Kennedy:
We knew from years of experience, dating back to the boys who had been in the Battle of Britain, that the 109 with its slim thirty-two foot wing was initially faster in a dive than we were. But we accepted that compromise happily in exchange for our broad superior-lift wing with its better climb and turn.
Jeffrey Quill
Nearly all our engagements with Me 109s took place at around 20,000 - 25,000 ft. The Spitfire had the edge over them in speed and climb, and particularly in turning circle
Al Deere
My experience over Dunkirk had taught me that when attacked the best counter was to go into a right turn. In this manoeuvre, the Spitfire was infinitely superior to the Messerschmitt, and so long as one remained in the turn, the enemy pilot could not bring his guns to bear
Andrew McDowall
In my opinion Me 109's cannot hit Spitfires in tight right hand turn because they can't turn inside you in stern attack
George Unwin
the Messerschmitt couldn't turn like a Spitfire...the Spitfire could sustain a continuous rate of turn inside the BF 109E without stalling
Geoffrey Wellum
However, in a Spitfire, just before the stall, the whole aircraft judders, it's a stall warning, if you like. With practice and experience you can hold the plane on this judder in a very tight turn. You never actually stall the aircraft and you don't need to struggle to regain control because you never lose it. A 109 can't stay with you.
Hugh Dundas
In one vital aspect the ME109 was at a disadvantage against the British airplanes. It could be out-turned both by the Spitfire and the Hurricane
That makes 13 of 15 or 87% felt Spitfire could out-turn BF 109
Still I think BF 109 was the better aircraft!
