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The article seems to be using “herd immunity” interchangeably with “eradication”. Those are two different things. We have herd immunity to measles, mumps, whooping cough, etc, but those diseases have not been eradicated and we have outbreaks every once and a while.

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Correct. If it's not eradicated, herd immunity leads to endemic equilibrium. Given animal reservoirs, it's not likely to be eradicated.

Herd immunity implies local eradication.

The whole idea is that with herd immunity there’s enough immunity that the virus is unlikely to circulate in even the unvaccinated, even if the population might be exposed by an external carrier and a small number of the members of the population get infected.

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