COVID-19 Outbreak Information Updates (Reboot) [over 150.000,000 US cases (est.), 6,422,520 US hospitilizations, 1,148,691 US deaths.]

I did notice that one of the symptoms they included in that paper was literally 'Fasting worsens symptoms', with significant increased symptom severity in that category for both long Covid and MCAS patients compared to controls and pre-long Covid patients. So while that won't be the case for everyone (it's an average, so individuals may vary substantially), that does suggest fasting won't be the way to go generally for that particular condition.
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.