That always struck me as very weird ... at the time it was in the (sole) context of CHINA. Now we have these Antifa + F_I things on the periphery. Floyd supposedly had $20 counterfeited which I believe is not uncommon ... but the $1 ... I think I recall the only possible explanation that I heard at the time was that the $1 bills might have been tainted with COVID-19 and the $1 denomination would have ensured maximum spread - but that was just speculation.
“$1 bills” plus “Location” plus “Timing (relative to WuFlu)”
...has always “struck me as very weird”. Leads me to speculate also.