Kodular is currently using ExoPlayer version 2.8.2 (2018-06-06)
I got a hint from @Boban how to find this after decompiling the APK:
The current ExoPlayer version is 2.11.3 (2020-02-19): ExoPlayer/RELEASENOTES.md at release-v2 · google/ExoPlayer · GitHub
I really hope @Kodular updates the ExoPlayer to this current version soon, because the ExoPlayer version 2.8.2 is completely unusable due to the issues in background / standby (sleep mode).
As long as this has not happened, I must continue to use the TaifunPlayer (for gapless looping) and otherwise the Player component.