I can’t disagree with this. I’ve had to update my 2020 craft to appear properly in the aircraft selection menu within 2024 per the following:
Besides having to redo my aircraft.cfg files to cooperate as expected, an issue may arise where 3rd party livery creations will likely appear in the aircraft menu as individual aircraft rather than within the respective aircraft hierarchy. This is because the field “ui_createdby” is quite often used by the livery creator for their own name and not the aircraft developer.