Classic 35mm Tri-X in D76 that we all know and love...
In reading the linked article, I see nothing claiming or implying the photo was captured on or digitally remastered to 135 Tri-X with processing in D-76 ! I think the OP topic does a disservice to the photographer of the photo by claiming what he did via the topic name.
My own roots are deeply embedded in photojournalistic photography efforts from several decades ago,. So I view extensive changes to an image as more 'artistic interpretations' than 'capture of the real world in images', whether done in the darkroom or in the PC. Yet I am firmly on the fence about this photo.
As for the 'alteration', I see darkening of the overall (crop) and some greater burning in of some areas, to mask the person in the background from attention. That is not nearly as obvious as digital postprocessing to replace pixels and conceal that someone was in the background, nor using conventional film-based alterations via darkroom techniques. The statement about 'changing the elements of a picture' I am not so certain about when it is print exposure time and dodging/burning as the only methods. So I am very much on the fence in judgment of the photographer's apparent guilt of 'alteration'; I would have to read the literal rules to fall on one side of the fence or the other.
Yet the image in question is NOT FILM...the article states that the British Journal of Photography rule is,
"The content of the image must not be altered. Only retouching which conforms to the currently accepted standards in the industry is allowed."
This year, for the first time, photographers were required to submit RAW image files if the judges suspected that photographs were manipulated beyond what the rules allowed...to examine the original (digital) image for evidence of pixel replacement, and while there is digital burning in and exposure changes to darken the shot, the original pixels are in the shot, but merely made less apparent to the viewer...is THAT not permitted? Interpretation of the rule comes with distinctions of what is acceptable 'retouching' vs. unacceptable alteration.
David Campbell of World Press states, "“Material alteration to the image by including or excluding a certain item” yet it is the ENTIRE photo which is darkened in this case, and if one looks at the photo one might be able to claim only that a vignette 'applied in the darkroom' helps to eliminate from attention certain portions of the scene...and is vignetting to be considered as 'material alterations'?! (I refresh that I know this was a digitally shot, but I am applying standards that formed decades ago from film photojournalism). Veteran photojournalists openly admit to having used a much heavier hand in the darkroom days, dodging and burning significantly to create drama in the photographs. So some previously acceptable alterations are no longer tolerated in the very black and very white analytical digital pendulum.
It all boils down to the subjectivity, and at this point we don’t really know what’s a fiction photo or a nonfiction photo. So the hard line is applied, as it has been again in this above example.
[edit]I just found this explicit explanation from AP's policy:
"Minor adjustments in Photoshop are acceptable. These include cropping, dodging and burning, conversion into grayscale, and normal toning and color adjustments that should be limited to those minimally necessary for clear and accurate reproduction (analogous to the burning and dodging previously used in darkroom processing of images) and that restore the authentic nature of the photograph. Changes in density, contrast, color and saturation levels that substantially alter the original scene are not acceptable. Backgrounds should not be digitally blurred or eliminated by burning down or by aggressive toning. The removal of “red eye” from photographs is not permissible."
So dodging and burning in are OK! But not eliminated backgrounds. I just landed him on the 'Guilty' side of the fence!