I don't care either way to be honest with you
My thought, is that Gabler, in the position he was in, was in a position to have his plane stripped more easily then a lower ranking pilot who would be flying what was given to him. I know it was done on all sides at times by individual pilots. Bud Anderson's comments about his ground crew stripping the paint off his P51D in one night, after he casually mentioned it to them as winter approached. He teared up talking about it knowing how hard they worked to come through for him.
Bill Olmsted, an RCAF Spitfire ace writes about it in his book. He and his ground crew stripped his Spitfire Vc of paint, along with removing armor etc to get more speed.
The fact that the tail swastika clearly has been sanded away and the upper wings are missing the insignia seems to hint at some sort of stripping of the paint.
Krusty, the article you posted, references the book I copied the images and profile from. I think the article agrees with what I just posted in that it's not a shiny metal bird, but stripped down as best they could get it. His beef seems to be with the model builders who give it an overall shiny metal finish, when it's clearly not polished natural metal.