Given that AROS has been in development for a decade and is still barely functional, it's highly unlikely that it uses any stolen source code. We're getting into Lawyer Land with the use of the word "illegal" in that statement. If it doesn't infringe on code, is there anything else in AROS that could possibly be infringing? Who knows and who cares? The "probably" qualifier on the word suggests that Mr. Carlton doesn't really understand the situation. Besides, it's irrelevant to the current case.
My decision: Ignore.