I am watching the  Nintendo Treehouse... I had to double check if I was on 1080p.

I think the game got a big decrease of resolution. I remember the game months ago was surprisingly sharp for the switch. Then, blackout for a year maybe ? I was definitely sure at this moment that they had decided to take their time for a downgrad because it was too ambitious for the switch at this level of detail.

So I am sure that we have a downgrad of resolution (1080 --> 900 ?), and also lower textures.

Nope, still looks good, but of course you can't have best quality of video when you have live streaming.

https://www.youtube.com/watch?v=639QlFAn8tU

It's possible it's just the stream quality.

Still...They were also streaming a year ago.

It looks fine, a lot like Woolly World except that Yoshi isn't Woolly this time

You're insane :P

Seriously though, it is difficult to judge the resolution from a compressed stream. I'd actually say that in terms of detail and lighting its been noticeably UPgraded since its original showing at E3 2017.