People test for a lot of reasons (for ex: their employer requires routine screening, or they are going to be proximate with immunocompromised people, etc.). Testing positive is not an indicator of poor health.
> The article mentions that, as well as points out that the material it is based on is not peer reviewed.
The article says that even when controlling for prior existing conditions, age, sex, etc, that outcomes are still statistically worse with each infection. The material is also preprint and will be undergoing peer review.
