It sounds like they mostly did something like that:

> The lawyers then tell the developer, “You can of course easily make a video game set in a furniture store that does not look like, or suggest, an IKEA store.” The presumed game development experts go on to explain, “You can easily make changes to your game to avoid these problems, especially since you do not plan to release the game until 2024.”

(from https://kotaku.com/ikea-furniture-horror-game-store-is-close..., linked in the article)

They also listed exactly what they think infringes their trademark.