From my sources, it appears that if any questions are asked, the COs will verbally communicate to whoever questions this that there is no additional document indicating that a vaccination requirement is mandatory.
So what I'm getting from this is that it's similar to the letter pioneers received regarding "an hour requirement" and some months later they were told specifically what hour requirement they now have.
If this proves true, then I'm hoping the Governing Body will actually own up in an upcoming GB Update about removing the COVID-19 restrictions from all schools, though I doubt any form of apology from them. Even the WHO, on 5th May 2023, formally announced that COVID-19 is no longer a global health emergency. So much for the "Chariot" that moves at "lightning speed", it's been so slow!