That is true history, in my understanding, but it's not related.

Chris Lattner offered to donate the copyright of LLVM to the FSF at one point: https://gcc.gnu.org/legacy-ml/gcc/2005-11/msg00888.html

He even wrote some patches: https://gcc.gnu.org/legacy-ml/gcc/2005-11/msg01112.html

However, due to Stallman's... idiosyncratic email setup, he missed this: https://lists.gnu.org/archive/html/emacs-devel/2015-02/msg00...

> I am stunned to see that we had this offer.

> Now, based on hindsight, I wish we had accepted it.

Note this email is in 2015, ten years after the initial one.