I did not see any updates on the API, so I assume it is either a bug or this change was not communicated.
When trying to retrieve information from https://apis.roblox.com/developer-products/v1/developer-products/universes/{universeId}/creator?pageNumber=1&pageSize=50 when you don’t own the experience, it returns {"errorCode":"UnauthorizedUniverseAccess","errorMessage":"The user is not authorized to access universe with ID: {universeId}.","field":"universe: {universeId}","hint":null}
Expected behavior
Before, it would give you a developer product overview for any game, but I searched heavily and did not see any announcement on changing this.