I guess it depends on your definition of 'partnering'. Right now I'm sitting in a Fractal / Librem5 workshop in Strasbourg with a bunch of GNOME and Purism folk, trying to advise on how GNOME can use Matrix well. We were also expecting to be funded to work on the Librem5 on a better than best effort basis, but it seems there wasn't enough $.
The Librem 5 page says “partnering with Matrix” but it now sounds like that has no meaning.