I find it completely ridiculous that you came to that conclusion.
They Maya learnt what they new because they they didnt have the things we have today, therefore for leisure, they observed the heavens.
Through experience and studying they discovered the changing of cycles, how does this remotely relate to knowing they would be wiped out by the Spanish.

If people like you spent the time to actually question your reality and study the facts you would realize theirs alot more going on in this universe than you think. You would also realize how limited our perceptions and ideologies are.