If there was any BS, then it was from Boeing!
Whether ba operated 767-200ERs or 767-300ERs is nihil ad rem. The point is that they struggle to operate from a 10000 ft balanced field in ISA / still air conditions at MTOW.
Those who've operated the ba aircraft on hot days at high AUW confirm that the take-off performance is utterly woeful under such conditions. Which rather backed up the Boeing FSTA bidder's comment "Runway performance? Yes, Airbus has got us beaten there!"
As for Voyagers evacuating whenever there's a significant weather event, that certainly isn't true at home base - but might be so in the S.Atlantic due to the inadequate hangar.
Still, until the Frankentanker actually flies (perhaps next year, but who knows...??), no-one will really know whether it can actually operate at MTOW from anything less than a 12000 ft balanced field in still-air / ISA / SL conditions.