Regarding this issue, I know for sure, and that's information, not an opinion, that MK doesn't feel well about his actual condition and he felt even worse with the TCT project when he met other guitar players of his age or older, already planning to go on tour, because he can't do it anymore.
Obviously I can't say from where I get this, but I was told that this is information, not an opinion.
Let's enjoy whatever he can record in the future and offer us, and treasure our memories of him playing live.