Having purchased Litchi and discovered it worked on my iPad Mini 4 …
I tried the DJI Go Fly App and was just prompted to upgrade on my iPad Mini 4 (10th Feb 2023). Prior to this upgrade I was getting the following warning: Mobile device CPU fully loaded. Related performance will be affected. Since upgrading to 1.9.4. I don’t get the warning 
I’m hoping this means I can now, once more, use my iPad Mini 4 with the DJI Fly App.