9 points,
Both quotes are taken out of context and therefore incomplete.
Re reference 1: The procedure says: Depending on the failure, the OVERSPEED warning may be false or justified. Buffet, associated with the OVERSPEED VFE warning, is a symptom of a real overspeed condition.
Re reference 2: BEA should have said that this applies at 1g within the normal envelope. High speed buffet is encountered beyond Mmo at 1g, or at more than approx. 1.5 g below Mmo.
The characteristics of 'low speed' buffet at low altitude are different from those at high altitude. The 'buffet onset boundary' shown in the FCOM or QRH is associated with local supersonic flow phenomena and I would expect the buffet to be similar at the 'low' and 'high' speed limits.