While most of that is true, I'd say there's more to it. Jon knows NK is not going to be as easy to kill as the other WW he killed earlier in that episode. What works on other White Walkers, won't necessarily work on NK.
The stare downs between Jon and NK foreshadow the 1 on 1 battle the 2 will have in the end.
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I keep hearing speculation about how Jon knows something.... and the NK will need to be killed a certain way.... how does anyone know this?
There is zero detail or description of the Night King we see in the show in the books.... in the books it is said he originated from the Night's Watch thousands of years ago and the show didn't bother with any of that speculative Westeros narrative.
The show has only shown us the Night King a few times.... we know he was created by the Children of the Forrest.... we know he has some way of stirring up winter storms wherever he goes..... we know he has the ability to essentially shield himself from fire on the ground.... we know he can turn dead people/babies/animals into wights/White Walkers.
We have never seen him fight.... the throw at the dragon was the first time he picked up a weapon.... so no idea if his fighting skills are elite.
No one has tried to kill him with anything and failed, so we don't know what can/cannot kill him.
Jon had a stare down with the NK at hardhome and again shortly last episode.... how does Jon know anything more than the viewers?
And if one more person says maybe Bran told him.... he hasn't fucking seen/talked to Bran yet.