All of it is incorrect for many cases for an A320NEO with Leap 1A-26 engines (the airplane modeled both by Asobo and FBW) – takeoff speeds, Flex temp, and THS. I have access to the NEO FCOM and other information.
As an example, the highest Flex temp it will output is 55 C whereas the actual max Flex temp for the Leap 1A-26 engines we are modelling is ISA+55C (70 C at sea level), not 55 C.
It is possible that the Flex temps may be based on CFM56-5B engines, but I cannot verify that. That would also not explain the incorrect speeds and THS values. In any case, it is not correct for the A320NEO with Leap1A-26 engines being modeled by the Asobo and FBW airplanes.