I think you will find that people find Wikipedia often unreliable and this is for a reason. All sorts of fanatics edit it, and for many of them its often more important to have their own opinion in there instead of creating good articles.
Its not too difficult to find out that the editor falsifying wikipedia was Minorhistorian, NZTyphoons local handle.
He was busy pushing that agenda (and equally busy removing any references to the German use of 100 octane fuel in the Battle in all articles. As a matter of fact, he seems to be very busy degrading any Luftwaffe related article).
He added the line "100 octane fuel was able to be issued to all front-line Fighter Command aircraft from early 1940" and 'quoted' Payton-Smith, because wikipedia generally require references, but in reality Payton-Smith says such thing nowhere.
It's quite simply that our friend NZTyphoon wanted his own opinion represented there, and to give weight to it he falsified the source.
Quite a bit like when lane manipulated the May 1940 paper on his website.