So you want to measure transmission rates under normal interactions, not during shelter in place/everyone wearing masks?
From the article:
Dr Feigl-Ding explains that R0 is the “R reproductive number at time 0 before countermeasures”.
He points out that this is not the R(effective) at current time under mitigation measures such as distancing and testing, tracing and quarantine, which are expected to slash chains of transmission.