https://www.advisory.com/en/daily-briefing/2021/03/02/reinfection
CDC study suggests some patients could face more severe Covid-19 with reinfection
For the report, researchers looked at two separate outbreaks that occurred three months apart at a skilled nursing facility in Kentucky. The first outbreak at the facility occurred in July 2020.
According to the researchers, among 12 of the residents who tested positive during the first outbreak and were still living at the facility in October, five—ranging in age from 67 to 99—tested positive again during the second outbreak.
Three of the five residents had asymptomatic infections during the first outbreak, but all residents experienced symptoms of Covid-19 during the second infection. One required hospitalization and later died, the researchers noted.
Further, according to the researchers, the two residents who had symptomatic cases of Covid-19 during the first outbreak experienced more severe symptoms during their second infection.
The article that you linked in post#56, actually presents a strong case overall, for powerful immunity resulting from natural COVID infections.
The few (3, 5) isolated cases of likely extremely frail and elderly nursing home patients testing positive for reinfection however, is more anecdotal.
It sounds like antibody enhancement as seen with Dengue Fever Virus. This is a legit risk IMO.