Ehh, while I don't agree with Serebii here, this doesn't seem right either. Because under this logic, like, yeah, theoretically that's true, but in practice Viridian Forest seemed rather crowded from the Treehouse demo and rather difficult to actually avoid each and every Pokémon, because of just how many of the things there were and how relatively narrow the Forest paths still are, making actually just walking past everything pretty much a non-option. Like, I remember one part of the demo where like the hosts were clearly trying to move on to a trainer battle or something, but kept getting into encounters anyway because it was hard to avoid them all.
So if it's the "forcedness" that bugs people, that still seems to be the case, at least in particular locations (I believe they also said that Viridian Forest in particular did have a high encounter rate and that other areas won't be as crowded, but we'll see what happens there).
That and if that's what what we're talking about here, previous Pokémon games have always had repels to fix this problem whereas in this game, because random encounters aren't a thing anymore, I have to wonder if Repels are still in the game at all. I certainly hope so, particularly if there are other areas that end up having similar Pokémon density as Viridian Forest, but we'll have to see what happens I guess.