Why is the narrative changing from COViD 19 virus to Corona virus?

Every year we are all Exposed to 4 different strands of corona viruses. The fda has just said in their website that the PCR test can not detect variants.

See FDA statement

https://www.fda.gov/medical-devices/coronavirus-covid-19-and-medical-devices/sars-cov-2-viral-mutations-impact-covid-19-tests#background