I think there was talk that if an app targets SDK29 (or maybe lower), it will act as it did in A10. Although the doc below explicitly states that scoped storage on A11 is enforced, regardless of your SDK.From what I read in another thread here on xda, Solid Explorer can access android/data. Tried it a minute ago and it really works - without root. So it is possible. How they do it? No clue. That's up to @HootanParsa to reverse/find out.
I also recentl;y read the following when looking up for something totally unrelated. It talks of various ways to side step the new scoped storage. But from memory, I think its all about external SD not the internal data partition.
Storage updates in Android 11 | Android Developers
developer.android.com
Without reading it too carefully (I was looking for something totally unrelated), I would assume that having a backdoor would negate the security fix.