The A350 will have a takeoff acceleration monitoring system.
For me the analog basics say: All commercial airliners are designed for a similar cruise speed off similar runways and therefore have similar wing and high lift device designs.
I know from experience that a 350T aeroplane from any manufacturer going long haul will have a V2 between 170-180 kts. A computer that tells me V2 is 150-something is just wrong or at the very least worthy of serious investigation.