Again the git history does not seem to agree with this. If you compare the history of analog_controller.cpp for example in duckstation and swanstation you will find that the in-file license header was added 3 years ago while the latest common change between the files is from 4 years ago. In other words swanstation is using a version of the source code from before the license change, not removing the license change.

If you have any source for these accusations please post it, because as you have relayed them so far they seem to be untrue.