I sense the goal isn’t to change anyone’s mind from “the election was stolen” to “the election was fair”. Rather, it serves to enforce the notion that believing the former is considered unacceptable.
The dominant message they will see is the notion that the election was fully legitimate and had nothing substantial occur that would question its legitimacy. Any compelling or specific counter arguments are simply not visible. So that unengaged person is learning the accepted stance is correct, the unacceptable stance must have a disclaimer because it is so wrong/dangerous, and that if they take that stance they also risk being labeled as crazy or expelled from the platform.