The linked content directly leads to what I said. Gnome developers should address this of course (and they don't want to), but I'll repeat recommendation for the end user - use KDE and avoid Gnome. It has been so not just because of the above issue.
No it doesn't, as you'd know if you had read it. The linked content is about a KDE program (Kate) having been broken by the negligent (malicious?) actions of Gnome developers. This is self-evidently not something "using KDE and avoiding Gnome" can help with (or has anything to do with).
If you're using KDE, you aren't likely to end up using Adwaita as your icon theme. The primary users affected seem to be users of the GNOME and XFCE flavors of Fedora where it's the default theme.
That's probably libadwaita (the successor to libhandy), which by the way also forces the Adwaita GTK theme. This post is about the Adwaita _icon_ theme. Those are 3 different components (solib, CSS, icons) that all happen to be called Adwaita.