Please stop spreading misinformation.
https://www.gov.uk/guidance/rapid-lateral-flow-testing-for-h...
https://www.gov.uk/guidance/rapid-lateral-flow-testing-for-h...
It may well be they're telling the truth about their school, but that still makes a blanket claim, like the one made above, misinformation when it's presented with no qualification to indicate it's based purely on an anecdote (I'll note the comment has since been edited to water down the original claim)