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The behavior and description of customizer->widget is confusing

enter image description here
In the screenshot above, the description says

Your theme has 2 other widget areas, but this particular page doesn’t
display them.

Unless I have a false understanding of the English above, this implies that except for the "2 other widget areas", widget areas are listed here, which intuitively are the 7 below. But apparently not all of them are on "this particular page". Actually, upon testing, only "WooCommerce – Shop" is on this page( I tried editing them one by one, but only adding content to "Woocommerce – shop" would affect the current page ). So, isn’t this description confusing? Besides, why does WordPress list the widget areas while they are not on this page?

Another confusion is, after I adding content to "Woocommerce – Shop", the number in the description change from "2" to "4", and the widget area named "Page Sidebar" and "LearnDash – Course Directory" disappear from the list, making the list becomes 5, down from 7.

Can anyone explain the description and the behavior to me please? I think they are related to each other.

My wordpress version is 5.8.2 and the theme is BuddyBoss. But I don’t think they are relevant here, the description and behavior here should be provided by WordPress but not the theme, right?

To see the problem I described above, please watch this 2 mins video:
https://www.loom.com/share/cc4e98d792a7445caffeedb796278f5a