You can still get it by taking any resultant symptom and exaggerating the hell out of it. Most of those qualify on their own right if bad enough.
I know someone who claims to have Crohn's and fibro and collects disability, but his credibility is extremely suspect.
Crohns is diagnosed via a biopsy iirc, it's not a diagnosis of exclusion like IBS is. Crohns is also horrific. so I wonder if you just view your friends poor health as a typical "no one wants to work anymore" way like most people do with disabled people. Fibromyalgia is somewhat a diagnosis of exclusion, but decent doctors can mostly figure it out these days. The hard thing is discerning whether it's ME CFS or not.