Not OP. I can't claim whether it's AI or not, just why it could possibly raise such concerns.
I think the UI elements and layout look very similar to how LLMs like to create them. It's hard to describe, but something about the rounded-edge, thick outline buttons equidistantly placed on the side bars, and heavily dependent on tabbed layouts in sub-menus. I'd argue there's parts where menus have too much empty space, which typically hints that a menu hasn't been thought out completely. It's also the most common type of game/dashboard view that LLMs are capable of: canvas in the middle with interactive buttons on the sides.
For an example of an immersive and good looking UI I'd look to something like Sunless Sea. It's a different type of game and is more narrative driven, but it doesn't have any of the more web-like UI qualities.