The decision was taken when new information emerged. Obviously sat behind the keyboard you have far more information but in the real world this is how it works.
Given how partisan you are, maybe you'll believe it if it comes from the Welsh Govt?
https://www.gov.wales/reinforced-aut...ishments-wales
"No immediate concerns", schools in Anglesey to temporarily close (just before the start of term I hear you scream!!), Expect to have the full results in two weeks ("putting kiddies lives at risk until then!"shouts you!) "New evidence provided" (why didn't you know before screams Sludge!)
You just always present these things as simple issues with pantomime villains and don't ever seen to actually realise the complexities involved.
Or more likely you do, but you just ignore them to make endless party political points on the internet