Earlier quoted context omitted.
Yes, I just imagined that despite his polemic nature there were still other people who could put up with dealing with him who also were part of the FSF and therefore the FSF could hold positions divergent from those of RMS. If the FSF consists solely of the opinions of RMS then I retract the previous statement and would say that the page mentioned expresses an opinion inconsistent with what is expressed in the email.
Generally speaking, the FSF and RMS agree. Nothing in the thread is inconsistent with this. RMS observes that the NCSA isn't copyleft, which is true, but that's a different dimension than free versus non-free.
"The values of free software are fundamentally different from the values of open source, which make "better code" the ultimate goal."
Clang wants to make a great compiler, they chose the NCSA license to facilitate that, according to the article makes it open source software and not 'free software' rather than 'unfree software'