I’ve just read the wiki and realise that my last experience at Salzburg is not the same.

My ET/Gold boarding pass would not operate the fast/ track security gate, but there was hardly any queue at the usual check. So, no. This is with the new security gates, whereas fast track used to be a completely separate access. As for boarding – there was no bus any longer, and they had one lane for priority and the other for everybody else – so yes.