Having played the game a lot as a child, I feel I know all the areas of the game pretty well, but I didn't recognize the area in the screenshot. I asked about it in a comment on the video, but it seems the video has since been removed from YouTube.
I know the game was remade around 2016/2017, with a few new / bonus areas, but the visual effects in the screenshot look more like the original.
But there are some other odd things: The color of the sky is more purple than in any of the other areas of the game, and there are 7 Elixirs, but the maxium is 3 (IIRC).
So what's going on here - Is this area actually from the game (original or remake)? Is it from a mod version of the game? Is it just a mock-up picture?