"Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith."

"Lockdown" can mean anything from closing pubs to mandating that nearly everyone stay home 24/7.

There's no great mystery here. The virus primarily spreads in indoor settings where people breath the same air. A lockdown is only effective to the extent that it stops people from getting into those situations. Closing pubs will reduce transmission a bit, but not nearly as much as telling everyone to stay home.