(Short Reflection) Is a molecular signal the only thing that is needed to start a "pandemic" event?

Thinking about the possibility of collecting Biobank bronchoalveolar lavage samples from the period (2008-2019) and performing Whole Genome Sequencing analysis, via the same set of primers/amplicons that we are currently using to detect SARS-CoV-2, in order to measure the background signal, I have concluded the following:

What am I asking for? For a molecular signal, a genomic/proteomic footprint. Not a disease-causing agent.

So what if not enough background signal could be found in the period (2008-2019)? The only thing that you actually need is to contaminate several places, via several mechanisms, with genetic material, in order to create this whole "pandemic" illusion and have a molecular background signal:

https://journals.asm.org/doi/pdf/10.1128/spectrum.01695-22?cookieSet=1