The phrase "remain closed" does seem to be at odds with what you claimed, OP
Secondary schools across most of England are to remain closed for an extra two weeks for most pupils, to help regain control of coronavirus.
Education Secretary Gavin Williamson told the Commons that exam-year pupils would return a week earlier than their schoolmates in the week of 11 January.
And in a small number of areas with the highest infection rates, primaries will remain closed temporarily.
www.bbc.co.uk/news/education-55487641