That is reductive, why not call all everything CGI then? Or call CGI pixel art as well? As we’re talking about “art”, it’s necessarily going to be subjective, but pixel art has certain style aspects such as use of 2x1 lines (https://www.the-pixel-artist.com/articles/top-ten-things-new...). This is just an example, while I’m not saying that every convention must be met in order to qualify as pixel art, not having any doesn’t make a useful definition of a genre.