That’s a really weird conclusion to draw looking at what’s happened globally and in local pockets. Look at Singapore and South Korea — full lockdown and great control, and then outbreaks in places where the lockdown put people in close quarters (immigrant labor in Singapore) orwhen restrictions were lifted (bars in South Korea). Look at Wuhan itself, where it took time to establish a lockdown and contact tracing, then they got control of the situation and had better outcomes, then a secondary wave once they lifted restrictions. Look at Italy, where the lockdown means Northern Italy has had a very different experience from the rest of the country. Sweden has had a mostly voluntary lockdown and high death rates compared to the rest of Europe and other very similar countries (Norway, Denmark, Finland) have had stricter lockdowns and better numbers.
Also let’s look at the fundamentals. This virus is spread through contact with viral laden particles, either in an aerosol or on a surface. It is obvious that to get the disease you need to come into contact with the virus. Limit contacts and you limit exposure, this is so basic I hesitate to call it science.
You have a tough row to hoe if you’re going to try and prove no correlation between lockdowns and cases.