I don't read this the same as you do.
2.2 is about your seat which your ST is allocated to, and then the sub sections below are reasons as to why the club may move you from your ST seat.
So 2.2.3 is only a reason why you may find yourself in a different seat to your normal seat, it has nothing...
I can only assume you have not read the club statement.
It is in place from the friendly on Saturday, but in addition to evidence of double jab, they are accepting proof on a negative lateral flow test. The Government from 1 October (if it goes ahead) have stated double jabbed for large events...
This is just the club, not the Government. There is (currently ahead of any U-Turn) the suggestion that only double jabbed will be allowed into large events from 1 October, so you may want to attend as many games as possible now, before being excluded.