How are you sure?
Look at the slide(s). The allegedly duplicated text are in red. The unduplicated text is in black.
The obfuscation was just a lame attempt to "protect" their own code. But, it doesn't matter, because it isn't relevant to the issue.
On the other hand, the allegedly duplicated text on that same slide has been found in public domain code as early as 1986, pre-dating SCO Unix.