This article is from 2019 and argues against the methods laid out in research article published at the same time. It does not provide adequate evidence to support your claim that thid is a myth. I Will do some more research later today, but this author writes for a think tank. I’d advise some due dillignece before reading this guys material. Forbes is also right leaning so will have some level of bias here.
That happened to me. I got COVID pre-vaccine, and for years after that I got every bug going, including multiple COVID infections. After time this seems to have passed. I have now gone one year without COVID, which is a miracle. I feel like my first infection buggered up my immune system. I think I have finally recovered now. I wish you the best of luck.