I've checked the image out in the Hazan Publications book on Doisneau, and it looks pretty much identical to the shot above. If anything, I'd be happy to accept it as almost a straight print: it was a commercial shoot, and so he had time and understanding of where lay the interest - the kiss. Exposing for that, would render the brighter-lit building much more dense, so thus lighter on print.
Digital 'control' and expectation can make things seem far more complicated than they often might be. If you look at the blur on the edges of the post, it looks real enough as not to suggest much monkey business with exposure to print.
Alternatively, it might have been lightened to take copy - never saw the shot as anything but the bare, unadorned print.