I am indeed referring to A320 series aircraft - I'm with easyJet.
As for the stuff online - I tend to read it with caution and use the company provided manuals as my reference. Something like that could have been written by someone who has misinterpreted it or has not updated it.
Vilas your first point is correct and is a way of disconnecting autothrust but is not the Airbus recommended way in FCOM/FCTM. They recommend moving the donuts to the TLA and pushing an I/D pb.