They’ve apparently been involved in Fedora since at least 2007 and the list of packages they maintain includes QT, so sure this isn’t some rando. Still, I doubt the backing of a low level contributor to the project will mean this proposal goes anywhere, especially the idea of replacing X11 outright when downstream packages like KDE (ironic) have indicated they won’t support it.

Do note, literally anyone can submit a change proposal to Fedora. This shouldn’t affect your view of the project.