With regard to his CBD. My understanding (from the 3 books!) is that there's no test to diagnose it; rather the diagnosis is given upon presentation of certain symptoms, after tests have ruled other things out.
So it's not necessarily the case that they made that up.
It could be that they were told it was CBD, or likely to be CBD, after other conditions had been ruled out, but his long and relatively healthy life has cast the diagnosis into doubt, and perhaps they felt unable to say that after things had gone so far.
It could be that he does indeed have CBD and is an outlier who's doing much better than most (after all, averages are just that).
Surely the charity for CBD wouldn't have had him as a spokesperson without basic due diligence. I know from my own illness that all the charities I've received support from or had any involvement with have required ID and medical letters.
If it turns out that the CBD story is completely fictitious then that's absolutely despicable but let's not go in with the pitchforks just yet.