No, but loss of smell is indeed a (very well documented) ”mystery effect” of neurological damage, so it’s not a regular ”flu” by any means. It’s closest relativ

No, but loss of smell is indeed a (very well documented) ”mystery effect” of neurological damage, so it’s not a regular ”flu” by any means. It’s closest relative is SARS1 and that’s also vastly different from flu. There are always psychosomatic or ”mystery” effects even with something clear cut like breaking a bone. Noisy data is the first thing you have to accept dealing with these complex systems. If you see a giant cloud of black smoke, it’s a good idea to assume there’s fire and invalidate it later, should it turn out to be something else.