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Well in my case the paper is entirely wrong. Fasting and an elimination diet are what pulled me out of the constant nerve pain I was experiencing. Not to mention all my blood work has been looking good, I have lost nearly 50lbs(from 226 to 179), and I have more energy than I have in a long time as well as feeling invigorated and much more focused. Many medical professionals are going to dismiss fasting because they(and big pharma) can't make any money from it, so it doesn't surprise me.
No, that's not how that works.

The people saying that fasting made their symptoms worse in that paper are the patients, not the medical professionals.

Your individual experience does not override theirs.

That doesn't mean it was just coincidence and that it didn't work for you, of course. The average experience doesn't override your personal experience either. But it does very strongly indicate it not only wouldn't work for everyone with those conditions, it would make a lot of them worse.