I'm happy to report that after two years plus of not running Bitdefender on my iPhone X, it seems the battery drain had been fixed. I did not notice significant battery issues and percentage usage was under 15% from 80% a few years ago.
However the new issue is that my internet surfing is severely reduced since installing the app. Just loading google.com took too long to load. Tried on my Mac and google loads in moments. Immediately I uninstalled bitDefender for iOS on my iPhone, google loaded in an instant and other apps also within moments. Therefore, I have uninstalled it again. Will try again in future and hope it is fixed.
Anyone experience similar issues?