A300B4 with CF6-50 engines max take off weight 336000 lbs with around 6 hours 30 mins fuel range would have no problem off runway 14 however subject to pressure altitude and temperature restrictions on runway 32 on specific day, so restricted t/o weight = reduction of load or fuel. The A310 is smaller.....
Wouldn't have thought that this is too relevant, may as well quote B757 performance when B737 is needed !
On a positive note, if you actually read the press release it states the config. is 19 F / 191 Y when the standard config is more like 28 F / 212 Y. I would assume that the 'missing 30 pax' equates to the weight reduction necessary to accommodate the necessary fuel load for non stop ops.