I don't know why I'm bothering to respond to such a ridiculous and unsubstantiable claim, but there's actual evidence in the form of work product that GNOME cares about UX. It can be found here https://live.gnome.org/Design/Contribute
But this is not evidence they know what they're doing. Or the designers may know what has to be done, but the organization doesn't know where to go. Maybe it's committee driven design.
They may talk about it, but it's like a presidential campaign speech: "Yes, we care about education, about healthcare, etc" but it's not necessarily true.
Their designers are good, and some good things come across, but in the end it's like having a car with a powerful engine and a crappy suspension, and it's this that shows in Gnome, they don't know how to put together a nice car, it always ends up with a ridiculous aerodynamic, small tires, etc