Karel the figure in the acap is not the oew.... that is the maintenance weight which is just a average figure. A359 oew is now 136-137t and I would guess a351 is 149-150t.
Odd. Airbus' marketing presentations clearly state "OEW 155t". I guess everyone uses a different weight definition.
Back when Airbus used to list OEW (Operational Empty Weight) in their ACAPs, they used an identical definition to Boeing in their ACAPs which covered pretty much everything but the payload (passengers, bags and cargo), catering/pantry items and fuel. MEW (Manufacturer Weight Empty) omits all those items covered in the OWE and is pretty much just the weight of the base "green" airframe with no interior fittings beyond the sidewalls and before it receives any fluids or is painted in a customer livery. For example, a 787-8 has an MWE of 114,000kg and an OEW (in a 242-seat two-class OEM configuration) of 120,000kg.
The Airbus Firefighting Guides have "Aircraft Configuration Weights" of 140,000kg for the A350-900 and 160,000kg for the A350-1000 which may be in-line with actual average airline configurations based on data we have, which includes 139,500kg for TAM A350-900 according to the flight-plan for GRU-MXP posted. We also have Cathay Pacific at 135,000kg, an unknown airline's A350-900 of 136,000kg in two classes and 144,000kg for one of Finnair's A350-900 configurations.