Chat about Novel Coronavirus - 2019-nCoV - COVID-19

Doesn't sound like they are that confident about it -

if you end your self-isolation period before 10 full days you are strongly advised:

to limit close contact with other people outside your household, especially in crowded, enclosed or poorly ventilated spaces
to work from home if you are able to
in addition to venues where it is a legal requirement, to wear a face covering in crowded, enclosed or poorly ventilated spaces and where you are in close contact with other people
to limit contact with anyone who is at higher risk of severe illness if infected with COVID-19

Sounds more like they are trying to let as many people with omicron spread it as much as possible over Christmas.