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Yeah I don’t think GOG has removed delisted games from users libraries.
Unfortunately it did happen to Oxenfree on itch instead of letting people who bought it retain access to download it after delisting. https://www.pcgamer.com/games/adventure/another-reminder-that-your-digital-library-isn-t-forever-oxenfree-will-be-completely-removed-from-itch-io-next-month/