I don't think this is the case. The Note 20 and Z Flip all run OneUI 2.5 but I believe it's still using Android 10 Build. If I'm not mistaken, Android 11 will be with the OneUI 3.0 release. If you have the S20+, you should be able to enroll in the 3.0 beta test coming out soon, but I use the S10, which the Beta isn't available for, so I'm not sure how you would do not that.
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