They had a ton of COVID cases (1M, in a population of 10M!) and have vaccinated heavily. They're also doing a lot of the social distancing things that they initially avoided.

Vaccination does reduce the chance of spreading the virus. Having 10% of the country get the natural variant and 45% fully immune, plus still doing the social distancing stuff, and requiring negative COVID tests for those entering the country, seems like a pretty good way of keeping delta under control.