The Ouachita Trail is an absolute treasure for backpacking, too. 200+ miles of uncrowded trails with well-maintained AT-style shelters along most of the way.
The implication seems to be that by advocating for the trail, the commenter is encouraging others to hike it, crowding the trails. Which echoes a sentiment I've heard from others too; the more people who hike a trail the worse it gets, from overcrowding and overuse.
Plenty of routes to responsible use - and there needs to be evidence to back accusations: especially against an individual who's presumably done nothing wrong.