This response doesn't make sense even on the 'logic' of eradication. The whole point of eradication - of exceptionally dangerous diseases like smallpox and Ebola NOT C19, but we'll put that to one side - is that you can contract trace the v v limited number of infected people.
Not that you must shut down an entire city because of one incident.
And note that WHO advised in November 2019 that contact tracing - attempted against that advice around the world with exceptionally disproportionate effects - is pointless unless the disease is at the v beginning and there are v few cases.
https://twitter.com/Francis_Hoar/status/1329380027788570624?s=20
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