Interesting read. Thank you for sharing that.

Looks like the CDC says the 2x more likely to get it again as unvaccinated but also say “ Research has not yet shown how long you are protected from getting COVID-19 again after you recover from COVID-19” so I can see from your source how perhaps the CDC might have this stance out of an abundance of caution.

https://www.cdc.gov/coronavirus/2019-ncov/vaccines/faq.html#:~:text=Yes%2C%20you%20should%20be,had%20 COVID%2D19.

Definitely something to keep looking into!