According to X means “in X’s opinion”, “if what X says is true”.
According to Harry, it’s a good film.
The train gets in at 8,27, according to the timetable.
We do not usually give our opinions with according to. Compare:
According to Ann, her boyfriend is brilliant.
(= If what Ann says is true, …)
In my opinion, Ann’s boyfriend is an idiot. (NOT
According to me, ...)
(Taken from Michael Swan, Practical English Usage, Oxford)