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.

the implication... without backing evidence.

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.