Yes it does say that, but doesn't make sense the LX would change according to the SAE J2807 standard and the LC200 would not.Nothing changed capability-wise from 2010 to 2011. Toyota adopted the SAE J2807 standard which is more conservative than how they were rating things previously. J2807 hits higher trim vehicles disproportionately, as explained in that thread. Check out posts #2 and #5 in that thread you linked.
I am not speaking for Toyota/Lexus, but just going off what I see and this thread is not referencing an official Toyota/Lexus statement and appears to
just be speculation to me....unless you know something about TeCKis300 and he is possibly speaking for Toyota.