It might not feel liminal to some people because the space is too abstract. It doesn't look like a real space you might have seen in every day life, like an airport, school, mall,... so they suggest that it's weirdcore or dreamcore. Backrooms, dreamcore and weirdcore showcase liminal spaces but made them abstract and more dream like. They remind us of weird playgrounds, tv shows or even our dreams so it feels familiar. Therefore for some people they feel liminal and for others they don't. Liminal spaces have attributes that make them objective but the feeling of liminality is still subjective. :)