Hi. I'm Quinn K, I made access to Griphotikon, a zine I made and had put into the Racial Justice Bundle, restricted, because I don't think it represents my work well enough anymore. I apologise for the inconvenience, but! The good news is that restricted projects you own, purchased in a bundle or otherwise, can still be downloaded!
Here is how you can still access things that were made restricted:
1. Go to your Library.
2. Go to "Things you own"
3. Go to "Bundles" and select the respective bundle you want to get something from.
4. In the search bar associated with that bundle, look for the game that got you a 404 error when you checked out its page directly.
5. From your library menu, you can just download games that were restricted directly, since you own them!
At every point, Itch makes it clear to creators that work that has been purchased isn't entirely removable. You can only make it impossible for new people to purchase, but everyone who's got it keeps it. The only way that a game can be entirely deleted from the site is I think if legality issues are involved.
Hope this helped, and... well, I guess feel free to check out Griphotikon, old though it is!