By Logan, wounds linger and his body is failing. The adamantium inside him is poisoning him. He is still capable of things an ordinary person couldn't survive, but he can't keep recovering as he once did.
The green serum temporarily lets him fight much harder. It wears off. After X-24's attack and the impalement on the tree, he dies.
There is no recovery waiting after the credits. The ending depends on him reaching a point his body can't get him through.
Laura also kills X-24 with an adamantium bullet. That result belongs alongside Origins, where Logan survives adamantium shots with memory loss. The injuries and circumstances aren't identical. These movies don't give us a rule that every adamantium bullet produces the same result in every person with a healing factor.
Age, illness and the actual damage matter. Taking the strongest recovery from another film and treating it as something this dying Logan must be able to repeat would miss what this movie has spent its whole running time showing us.
By Logan, wounds linger and his body is failing. The adamantium inside him is poisoning him. He is still capable of things an ordinary person couldn't survive, but he can't keep…
· Film and Television / Marvel