Me, too, Serge Witte. I'm not a physician. The diagnosis was from Charlotte Zeepvat's Romanov Autumn, and I was going from memory, but I don't rememember a tubercular component. Oh, well, it's a small matter now, no?
You seem to be right: Wikipedia mentions cerebro-spinal meningitis as the death cause. So no tuberculosis involved. Just extreme bad luck for him.
Well, I checked another source which says it was Tuberculous Meningitis. So maybe it was a sensitivity that existed in the family after all. His mother had it, and several other Romanovs died from one or another form of Tuberculosis.