Only (in the case at hand) if they choose not to apply the free system update, right? And even then, only to the extent that they use cellular network calling?

It looks to me from the list that the newest device that needs replacement (vs updating) is a Galaxy S7, released 2017, which would be well outside the 5-year-extended-warranty period that seems to be the longest one they sell at your link, no? If I’m reading it right.