I am definitely not the one to speak with any clarity to calculation items in this forum (and was actually waiting to hear from them), however and since they did not respond, the easiest way I perform that analysis is to select the items then use Window>Pallets>Element Information that will return information about the selected items, including area. You have to add the areas up separately as there is no total.
I know there are many others here with better ideas.
Scott
AC27 v. 4060 w/ MEP, Cadimage, Twinmotion 2023.2.2 using AC from AC6.0, 2021 MacPro M1 chip, Adobe CC. Used AC on both platforms.