The study measured correlation of lockdown measures with number of reported cases, not positivity rate or death rate. Did they correct for number of tests done

The study measured correlation of lockdown measures with number of reported cases, not positivity rate or death rate. Did they correct for number of tests done per capita in each state? I saw no indication that they did. N.B. Written by the same person who wrote the economy was just fine in 2008 the day before Lehman Brothers declared bankruptcy.