It’s incorrect, obviously. If the test were “are you human”, there would never be a less than 100% positivity rating and it would be useless.
Table 1 in this link references the exact gene sequences used in RT-PCR testing: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7144809/
Those sequences are only found in SARS-CoV-2. They’re the sequences that differentiate SARS-CoV-2 from anything else.
The two main issues with RT-PCR testing are:
1) A high false-negative rate. Nearly 100% false negative on the day of exposure. 67% false negative by day 4. https://www.acc.org/latest-in-cardiology/journal-scans/2020/05/18/13/42/variation-in-false-negative-rate-of-reverse
And 2) An inability to distinguish between an infection likely to cause symptomatic disease and the mere presence of SARS-CoV-2 genetic material. This is particularly problematic for individuals who have already beaten the infection, but continue to test positive because viral proteins remain present at the swab collection point (typically the nasal passages).
I agree with you to an extent. But consider “spiked” batches of test kits.