OK here we go!
1) The Night King decided to change his shirt for some reason (the two X's will be explained shortly)
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2) Here's a brighter version of the same shot you included
@Poker Zombie
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3a & 3b) Next shot where the NK starts to turn to ice
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Shot 1 - green "X" shows about where the NK was stabbed originally to turn him into the NK and the red circle shows the
possible approximate areas (based on shots 2, 3a, & 3b) where Arya stabbed him to kill him. I saw possible approximate because it looks like the place where she stabbed him changes from shots 2 & 3a/3b. Shot 2 its clearly between his "armor" (at least thicker leather bands) and shots 3a/3b it looks like the knife is now above that gap and in that leather band area.
What does this mean? I'd argue both scenarios could still be equally as true. He could have been stabbed in the exact same place as before or a different place.
Why? 1) In Shot 2 it's not clear where in the gap (left/right) he got stabbed so this close up could have been meant to show him getting stabbed in the same point as he first got stabbed. 2) In Shots 3a/3b it does appear the location moves to above the leather armor and is not in the same place as he originally got stabbed. While it could be argued this was to show he was
not stabbed in the same place I think it's equally if not more likely that it means the show just messed up on continuity here since the location is clearly different in the shot just before which as a close up, is much more likely to have been done to show the specific place he was stabbed. Shots 3a/3b are farther away and to show the NK turn to ice and to shatter, not to clearly identify the location he was stabbed thus the location matching is not the most important part of the scene. 3) Again going back to what the show runner said "we knew it had to be... [in] the exact same spot" where he was created. These all together, to me, shows it up in the air but still quite possible they meant for him to be stabbed in the exact same place.
So... Personally I still think it's 50/50 but can see both sides and why they'd say its 100% in either case.