How about the art pack? That link seems to be more music.
It's not an asset pack, it's an AI-generated image that looks like it's (poorly) copying art from Bagrash. If you want some art like this, you should contact the man, himself: https://twitter.com/BagrashPixels/status/1633520170701398049?s=20
Yes, that's right.
While midjourney doesn't prohibit the distribution of assets, if you need a particular image, it's best to commission the artist directly. In the current situation, it's not only a way to avoid any potential trouble, but also a way to show respect for the artist. So, that would be the most advisable course of action.