This isn't supported by the available evidence. Spain was forbidding people from leaving their homes except for essentials, and now they're worse off than the US in terms of hospitalizations and deaths. Many other countries also had stronger lockdowns that have not spared them from winter surges.
You can say that they didn't do "real" lockdowns, and that if people would just sit quietly in their homes for six months then it would have gone away. Which is about as useful as saying that if everyone ate less and exercised more then obesity would be eliminated, or if everyone stopped having sex outside of marriage then STDs and teenage pregnancies would no longer be problems. Humans do not have infinite willpower, and if your plan is to assert that they should and then shame them for their horrible selfishness of wanting to occasionally visit their families, it is going to fail.