Ok so you have the right answer but you keep it in your mind LOL.
Even if it's totally ridiculous to compare pictures of a 20yo isometric game with actual games, just compare only one official map from BG where there's grass with one of DoS2 maps...
How the hell could you say one's colors are not more cartoony or flashy than the other's...
https://baldursgate.fandom.com/wiki/North_Nashkel_Road?file=Area_n_of_nashkel.pnghttps://guides4gamers.com/sites/6/maps/24-6/slices/2/2x2.jpgMaybe you'll understand a part what they mean talking about "cartoony graphics" (or not because I don't think you want to understand differents point of view than yours... Your goal is only to say they're wrong)
Anyway a simple reshade mod should already help about that.
