Their surveilance detected the covid outbreak early, and they were the first country to lock down, at the end of December, 2019. This is while the WHO and CCP were saying there was nothing to worry about. The CCP was already supressing the truth and arresting doctors who tried to spread the alarm.
They had a game plan ready to go that they had developed after the SARS scare, so they just ran that plan.
Even so, it took them until May 2020 to reach covid zero. They were the first country to do it.
This provides a best case scenario for lockdown and containment - an island nation that caught the problem before a general outbreak - and it still took 5 months.
Since then, they've had new cases from foreign travel.
I never doubted that the government knew what it was doing. The vice president was an epidemiologist! It's hard to emphasize how different this is from many western countries where politicians tend to be innumerate and come from legal or management backgrounds.
Plus their extreme version of contact tracing and tracking does the trick.
Places like Singapore and Hong Kong aren’t as geographically isolated as Taiwan is so the mandatory quarantine actually works.