I think this version of the Harrier is limited to E/F Mavericks, as has been stated. It is possible that the software literally won't be able to fire (or even detect) other versions on the pylons. I think most of the argument is around that little detail. Can it, or can it not?
The manual seems to say no, but that is by omission. It doesn't outrightly state that the others won't work. However, this is reasonable, the kind of maverick the plane they get is determined by A) what is available, B) The war planners' chosen target, C) the expected conditions at the target. The NATOPS for the USMC won't mention weapons the USMC never bought or used, but its not a definitive document about every little bit of weapons' compatibility. It only states the useful information the pilot needs to know.