Apparently you have a reading comprehension problem because you are bitching about not understanding information about a single subject from multiple sources.
Here is an online resource where you can learn how to read.
https://scitexas.edu/blog/improve-reading-comprehension-adult/ i'm always happy to help the less fortunate ;)
Explain what is a rapid antigen test compared to a PCR test.
Do that and you’ll see why the article makes no sense.