From Wiki - I guess they are just using data to obtain dubious speed figures. Was it on flight tracker for the ferry?
During EBACE 2016, it was commented that the program was on track and test flights had been free of surprises; during a
transatlantic crossing to the US, P02 had achieved a cruise speed in excess of 800 km/hr (432 kt.), which was better than expected.
The three prototypes flew 2205 hours including
icing conditions and very hot temperatures, outside its
flight envelope,
bird strikes,
structural stress tests and
noise tests before it received EASA and FAA type certification on 7 December 2017. Its performance goals were met or exceeded, like its maximum speed raised from 425 to 440 knots (787 to 815 km/h).