Lowering quarantine is not inconsistent with zero-Covid. The vast majority of cases test positive during the first 10 days.By contrast, weren't there also reports on rumours that China may retain its "Zero Covid policy" for another five years?
(Such as reported here by the Guardian)
https://www.theguardian.com/world/20...ast-five-years
I think this is more of an indication that they are comfortable with a small number of cases leaking through.