My point was that if you got GTK+/gtkmm from any official sources talking about a "stable" release, it would definitely have been talking about GTK+ 3 and not 4.
Perhaps the confusion is the chosen numbering for the GTK+ 4 development branch, which is currently being prereleased with version numbers of 3.9x. Yes, 3.22 is the LTS version of GTK+ 3, i.e. the current stable version, and the last minor release within that. See https://blog.gtk.org/2016/09/01/versioning-and-long-term-stability-promise-in-gtk/
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