this list is not official and it was prepared on the basis pf samsung updatepolicy for 2- 3 year ,so they created a list of that devices which are eligible for 2nd or 1st major update, there may be a change in official list may be some more devices add according to capability...
Samsung is now giving 3 major OS update to most (Flagship devices launched with Android 9 or later version) of its smartphones – If you have a Samsung Galaxy device launched with Andriod 9 Pie and One UI 1.0 out of the box, then you are eligible (technically) for the next 3 versions of Android (Android 10, Android 11, and Android 12).
