Why should I believe this is any more real than "chronic lyme"? There are a whole lot of hypochondriacs out there; something proponents of "long covid" and "chronic lyme" never seem willing to acknowledge.
The groups promoting both of these organize and operate the same way, and make similar claims. Huge lists of nonspecific generic symptoms and facebook groups full of uncritical believers mutually reinforcing each others' beliefs (parallel to the well understood phenomena of "support groups" which promote eating disorders and create social feedback loops for reinforcing/worsening body dismorphia.)