So is it safe to assume these assets are CC0, as in users can just do whatever they please with them and use them in their own projects, yeah?
Viewing post in Sci-Fi Museum Asset Pack comments
Unfortunately, absent an explicit license, the only thing it is safe to assume is that these are under the default All Rights Reserved status of copyright and cannot be used.
This is clearly not the intent, but without a license it is the situation. Hopefully the author will update this with something that grants usage.