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〜とは限らない: not necessarily
N2 · 08 Inference and judgment
Says something is not always true; there are exceptions.
Plain form + とは限らない. Often used with words like 必ず, いつも, 全部 to correct a common idea: 高いものがいいとは限らない. It is a partial denial, not a complete one. Spoken form: 〜とは限らないよ.
Examples
有名な大学を出たからといって、仕事ができるとは限らない。
Just because someone graduated from a famous university, it does not mean they are good at work.
高い店の料理がいつもおいしいとは限りません。
Food at expensive restaurants is not always delicious.