I've never heard of such a thing but if so I'm glad there's something to at least try.
I don't personally know anyone who still hasn't regained their sense of smell, but for some it was a year or more before it returned fully.
I do know 2 people with 'long covid' who are just super low energy (not a severe case).
Im just excited it's all being looked into now as opposed to being blown off or labeled misinformation.
[1] https://www.uab.edu/reporter/patient-care/advances/item/1000...