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It's not as straightforward as it seems, because the legal capacity to change a will depends on whether he has sufficient mental clarity at the exact moment of doing it (not on the diagnosis in general), so he would need a serious professional evaluation, preferably with a notary or lawyer who documents his cognitive state that day.
What works is having a forensic mental capacity evaluation done by a specialized expert a few days before executing the new will, because that documents exactly his cognitive state at that moment and protects the act legally. I knew someone whose grandfather had mild Alzheimer's, made changes to his will with an expert assessment in place, and later when some family members tried to challenge it, that expert report was what held everything up in court!
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