When did meta come to mean strategy? It can't really be 'meta' if its about one specific game or implementation.
MetaGame is not strategy. The metagame is often the behind-the-scene variables that enable a certain set of strategies to flourish. For example, in Dota, changes to armor or magic resistance scaling can change the metagame to be magic or physical focused, but the strategies and trends themselves develop in ways that take the meta-game into account. During one meta game, it is common to see various different strategie…
Small tweaks to the rules or weights (simple numeric multipliers!) can dramatically change how the game is played amongst those who are incredibly skilled at the game's fundamentals.
Metagame is truly emergent phenomena.