It's not like anything he says is a secret:
https://www.linuxfoundation.org/ 900 open source projects 3M+ developers trained
It's right there on the front page.
Linux foundation never supported desktop development, and I suspect they have their reasons. Maybe that a GUI is a very subjective thing, there are dozens of desktops, supporting one would probably cause major wrath from everybody else, so if Linux Foundation were to support the desktop, they'd have to support all. But Gnome has often shown to be hostile to outside influence, so maybe they don't really care to mess with that. KDE is based on QT, and maybe the QT dual license isn't within the scope of Linux Foundation to support? So with the biggest desktops being somewhat problematic, maybe it's better to just leave it alone.
The real question IMO is why Linux desktop doesn't have better support from other foundations? Why aren't any of them able to attract more financial support?
Personally I liked Gnome 2, and I think Gnome did a lot of harm to Linux when they deprecated it before Gnome Shell was ready, and I think Gnome alienated many users with the design decisions of Gnome shell.
Then the problem is that almost every GUI Desktop on Linux is based on some flavor of GTK which is under Gnome, or based on QT with the dual license.
Personally I don't mind the dual license of QT, but many Linux developers are very idealistic, and don't like it.