Agree, if the FR trace is correct, it didn’t backtrack and had just shy of 1900m TODA. 787-8 is going to need about 50T fuel for that route so take-off weight in the ballpark of 205T. Googling the Boeing Airplane Characteristics, that weight suggests at least 2200m is required.
It would seem extremely odd to mistakenly take the only intersection available though which is half way down the runway rather than a backtrack.