Ok, well I have a new theory then. Given that the porsche.com/usa configurator for the Targa 4, lists, as the standard info, that the Targa 4 is
RWD , it could be that this screw-up in the spec data has the configurator showing the optional in RWD car LSD as an option for the Targa 4 (which, as a 4wd, comes standard with LSD).
That would also indicate why my dealer is saying that option 220 (LSD LOCK) is being kicked back as "conflict with model".
This is what happens when someone doesn't properly test websites before releasing, nor provides enough data for the user to understand. After all, how hard would it be to say "For RWD cars, the LSD provides friction disc lock on rear axle. Pull - 22% and Push - 27%." At least then it would be clear to us that the option is erroneously being offered.
Good times... good times....