What George is saying is that X% (99% or whatever) of laser disc based playback devices (CDPs, DVDPs etc.) inverse the polarity (compared to what is stored on the disc) when the disc is read and/or the data is processed. It is really meaningless of course and does not do anything to disprove the 50/50 theory of polarity. It only means instead of the distribution being 50/fifty it is now fifty/50. :-)
But all in all you are right of course.
Cheers!