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@olabreche

Not really, sorry.

If you have a public post, it's best to assume that anyone will be able to see it, because public posts can be seen by anyone without even logging in.

Nearest is to hide your profile from search engines, but that will not hide your public posts as they will be on threads and feeds outside your profile. (If you do want to hide your profile from search engines: Edit Profile > Privacy & Reach > Search > Include profile page in search engines, untick this and save.)