Jon Is Most Likely Wrong About The Night King's Weakness

Comicbook.com reports that Game of Thrones fans may have missed a major clue this past week.
Danaerys, Jon, and the vast army they have collected are preparing to confront the Night King...
Jon plans to place the dragons near the heart tree, luring the Night King to Bran and burning him.
But the show has made a point of showing us several times that fire has no impact on the Night King.
The White Walkers and wights weaknesses seem to be dragonglass and Valyrian steel.