BOAC
It is NOT new, it has just been re-emphasised by Airbus Boeing regulators etc as some pilots / checkers were thinking like RWA as in maintain ALTITUDE. The procedure being continually mentioned by RWA was recovery from low speed NOT a stall and even that did NOT mention MAINTAIN altitude. There again perhaps I have been teaching and checking it incorrectly for the last 10 years on the A330 / 340 and been taught stall recovery incorrectly for the 30 years before that.