they've changed the rules literally a day or two ago which explicitly state a 30 day extension must be taken before any unable to travel due to covid extension is given.
scan that QR code, it should take you to the details or the place you need to register online to get the vaccination history. Been a few months since I did mine so can't remember which one it will take you to
their best bet is to see whether the covid extension is extended again or ends on Tuesday. If it ends then they'll need to make plans to either get different visa in country or leave.