First off all, that's not what I said, please try to at least somewhat understand what people are talking about before inserting yourself in a conversation. I never said that it was all about preparing and anti stratting, I simply refuted this guy's argument that teams haven't prepared for EG even though they had numerous deep runs at tournaments and have gotten multiple big series wins over top teams before winning New York.
But to answer your question: They have zonic and glaive (and probably analysis staff) who work their fucking asses off coming up with new strats and tactics trying to keep things fresh. Just because a team plays a certain style doesn't mean their strategies stay the same the entire time. If Astralis hadn't done this they wouldn't have been nearly as dominant for such a long period of time.