Unfortunately that is correct. Apple removed SteamBirds: Survival HD (the iPad version of the game) on roughly 2019-01-19 because the app "has not been updated in a significant amount of time." Similarly, Apple removed SteamBirds: Survival (the non-iPad version) on 2022-03-22, presumably for the same reason.
As we no longer work on this game, we do not foresee submitting an update in the near future to get either version back onto the App Store.
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