I don't think they were ever fully turned off, just made remarkably harder to find in the wild. I saw someone post a screenshot of a wild A-Geodude the other day and saw someone claim they found a wild A-Exeggutor semi-recently.
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This is the first time I saw it back. Did saw A-Exeggutor a few times, but never for a A-Geodude nor A-vulpix.
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Vulpix, Grimer, Meowth, Sandshrew (and respective evolutions), Marowak, and Raichu have never been available wild. Other than Alolan events, Exeggutor, Diglett, and Geodude are very very hard to find wild seems to be word on the street.