Well maybe you should edit it to say "the physical length of the lens when on the camera, measured from the lens to the image plane."
Personally I find it obvious that the definition is written from the viewpoint of the SLR/RF. The bellows is an integral part of the equation, when looking from the viewpoint of a LF shooter. But of course there are much less of us than the aforementioned group. So it was written without regard for this subset of photographers.
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