(The F-Droid branch at least) will "shim" the trackers, meaning rather than attempting to dive into the code of every single update and remove all the tracking hooks, it instead replaces the tracking code with blank functions that don't do anything but exist just so there is something there when Firefox attempts to call into them so it doesn't crash.
Naive scanners that simply read the list of classes that are in the program will see them and go "ooh there's a tracker here", but they can't distinguish between actual tracking code and these "neutered" versions that don't do anything.