When i was in elementary school i remember first hearing from a friend of a friend that there were books for Eps 1-3 and 7-9, and that the ending books got weird with Luke destroying planets and starships with his mind.
I still don’t know what that information was based on, i am assuming it was EU stuff, but i have never been into the EU so i don’t know.
Sounds like he misremembered an event from the novel Darksaber. In that book, Luke’s Jedi students all pooled their Force energies together to destroy a fleet of star destroyers attacking Yavin 4.