The guideline to be able to access apps without an account still exists, but the enforcing might have become lighter - or it's just the random fluctuations in review qualities we all know by now :)
https://developer.apple.com/app-store/review/guidelines/#dat...
(iv) Access [...] Where possible, provide alternative solutions for users who don’t grant consent. For example, if a user declines to share Location, offer the ability to manually enter an address.
(v) Account Sign-In: If your app doesn’t include significant account-based features, let people use it without a login [...]