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YouTube is now hiding the skip button on mobile too
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Maybe you have downloaded the wrong APK, there are some bad actors providing "pre built YouTube Revanced APKs". Be sure to only download the Revanced Manager from https://revanced.app/ and the unpatched YT APK (version should match the recommended one in the manager) from a trusted source like apkpure etc.