I don't think Samsung Note 20 will get Android 14 (One UI 6). If i am not mistaken, Note 20 start from Android 10 and Android 13 is the last. Same goes for Samsung S20 series too.
Anyways, let see later. Who knows if Samsung kind enough later. Lol
Yes, like you said....if they are kind enough. They can if they want to. Especially now, we are looking ar sustainability and less electronic wastage. But profit will be their deciding factor.