In the October Modern Railways report the Alstom Managing Director UK - Rob Whyte is quoted "The trains can reliable achieve 80km (around 50 miles) on battery power between charges....".The range is 90 miles as reported in green signals etc. This is the range Alstom have committed to deliver and actual range is likely to start at longer than this. This will be the range based on line speeds on the non electrified sections of route.
For the services and duty cycles this is more than adequate given the availability of terminal charging.
So that's two Alstom reps, who are building the train, reported as quoting 45-50 miles and one TPE rep claiming 90 miles? Only eight years to wait to see who is correct.