I find the mentioned message in the release-notes descriptions of the AutomationCore - Feature 322080: Kernel ... actualisation. Here it will descriped (amongst others) what additional kernel-driver BoschRexroth added to the ubuntu-system and where you find the description stored at the core system itself (no access for the "normal" user).
Last but not least this new drivers will be the basic for new functionalties coming with the next RM like health index of the core system (temperatur information, fan, ...). So stay tuned what is coming for the next RMs.
I will talk to the development to modify the release-notes, that this internal information will not be mentioned anymore....