All the scarf comment on twitter told me was that it was a ship tease. I don't think people should take more than that from it, especially given the coincidence that they mention the scarf suddenly when the NH fans have been talking about it nonstop and making fanart the past few days.
The tease at NH is very obvious and gives you the impression it will be canon. And that's what is wrong with this picture. No writer or anyone in the studio would be that straightforward about a pairing spoil unless they want to loose their job.
For example, the guy who responded to Pepsi avoided all the NS questions and didn't give confirmation. The ambiguity there is the hint. And NaruSaku has always been this way. So obvious yet we never get straightforward answers for the pairing subplot. So when I see things like that twitter it assures me that NH definitely won't happen.
While I know that logically, all this ship bait and teasing is still exhausting to go through. I don't think the NaruSaku fandom has ever been the same since 693 and now we have massive amounts of paranoia and depression everywhere. Seeing all this and the annoying ship teases makes me not want to care anymore. But I do, unfortunately.
I guess we just need to bear with it until pairings are confirmed. Something tells me things will get worse before they get better.