That is simply bollocks.
On 7 Dec Gigobuster posted a link to study in Nature [again here] comparing the effectiveness of a large range of NPI [Non-pharmaceutical interventions]. Curfews - in the form of individual movement restrictions and more general lockdowns - rate very well. They say [a quote Gigobuster already used]:
The most effective NPIs include curfews, lockdowns and closing and restricting places where people gather in smaller or large numbers for an extended period of time. This includes small gathering cancellations (closures of shops, restaurants, gatherings of 50 persons or fewer, mandatory home working and so on) and closure of educational institutions.