He has an op-ed in today's Wall Street Journal saying similar things (unfortunately behind a paywall, I am a subscriber). He says:

"Are shutdowns enough? No. Despite the efforts, there is still enough human contact to ensure the virus will spread. Take a look at the long list of 'essential' services and exemptions on California’s Covid-19 website, for example. Shutdowns will cause the virus to spread more slowly, but it will spread nonetheless."

He goes on to say herd immunity and/or vaccines are the only real way to stop it and that creating the hospital infrastructure necessary to deal with the patient load is probably the best bet until then.