The article's usage seems to drift around somewhat, but in esports I follow "meta" refers specifically to the consensus about which strategies are good or bad, not to strategies themselves or to anything someone does in a given game.

E.g. saying "foo is meta right now" means most players consider foo to be stronger than the alternatives, and if a player uses a strategy other than foo one might say they were playing off-meta, etc. But the term is wholly distinct from strategy itself.