O diretor James Mangold respondeu a essa em uma entrevista com o Empire Online .

Nesta versão do XCU, as habilidades do fator de cura de Logan se alteraram com o tempo. Enquanto eles ainda o curam, eles não o curam perfeitamente, deixando cicatrizes.

“One of the things we all thought about as we worked on this film is, well, we don’t want to rebuild everything. We want to have some questions. In order to make a different Logan, and a different tone of a Wolverine movie, we felt like we couldn’t hold on to every tradition established in all the movies religiously, or we’d be trapped by the decisions made before us. So we questioned whether Logan’s healing factor causes him to heal without even a scar. We imagined that it may have when he was younger, but with age, he’s getting older and ailing. Perhaps his healing factor no longer produces baby-soft skin. So we imagined he heals quickly, still, but it leaves a scar. The simple idea was that his body would start to get a little more ravaged with a kind of tattooing of past battles, lacerations that remain of previous conflicts.”

No corte final do filme, seu fator de cura não só deixa cicatrizes, mas também funciona MUITO mais lento. Está strongmente implícito que o adamantium dentro dele está envenenando-o, resultando em um fator de cura reduzido.

Não, o fator de cura dele não está funcionando como antes

Como explicado no roteiro oficial:

Now might be a good time to talk about “fights” described in the next 100 or so pages. Basically, if you’re on the make for a hyper choreographed, gravity defying, city-block destroying, CG fuckathon, this ain’t your movie.

In this flick, people will get hurt or killed when shit falls on them. They will get just as hurt or just as killed if they get hit with something big and heavy like, say, a car. Should anyone in our story have the misfortune to fall off a roof or out a window, they won’t bounce. They will die.

As for our hero with his so-called eternal life and healing. Well, he’s older now. If you keep reading, you’ll discover Logan’s about to get his ass kicked. But before we get to that, we should make it clear his abilities ain’t what they were. Yes, he’s a drunk, but he’s also fading on the inside. Adamantium implants leeching into his system, causing chronic pain and diminished healing, hence booze as painkiller.

So by all means, go ahead and worry about him. Now where were we? Oh, yeah--
_{- Mangold et al. (2016), "Logan", Final Shooting Draft Screenplay}

Ele é mais velho, e o revestimento de Adamantium está lentamente envenenando-o ^[1] .