“There’s some flu around, but it’s having a very difficult time spreading this year”
Total BS conclusion. The conclusion is that even the flu is guessed at every year and this past year the guesses went to COVID instead. Period. End of story.
The Influenza testing is specific to Influenza and certain flu tests provide the precise strain and lineage. The testing for SARS-CoV-2 is specific to SARS-CoV-2 and triggers on the precise genetic sequences that differentiate SARS-CoV-2 from all other viruses.
Influenza virus and SARS-CoV-2 are as similar to one another as humans and snails. They aren't even in the same phylum. There is zero chance of any testing failing to distinguish between the two. CDC guidelines state that laboratory testing must always be performed before claiming something is COVID-19 whenever it's possible to do so.
Your claims do not make sense in light of the facts.