Whatever the 'Android' directory is, I suspect (because I don't have one), it is not related to Buildozer's operation
And my '.android' is tiny in comparison:
~>du -sh .android .buildozer
1.8M .android
9.8G .buildozer
So that is almost 30GB due to some other tool (Android Studio?), can't help you with that.
My ~/.buildozer is bigger because I have lots of SDK versions, which is not typical.
To reclaim project disk space 'cd <project>' and 'buildozer appclean' , to loose it again 'buildozer android debug'
On a clear disk you can seek forever.