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Ex post facto is for if a new law is passed making something a crime, and the act was committed before its passage. This is all about interpretation of already passed law. It’s basically the justices saying that this was against the law the whole time. Ex post facto doesn’t apply here.
No laws have been changed. Court decisions are not considered the passage of a law, so ex post facto doesn’t apply. Changes to how laws are interpreted don’t factor into ex post facto considerations.