eh this style sits more on the furry side, while not completely furry, it is more furry than it is monstergirl, as monstergirl as the name implies is distinctly a girl with monster features, although the exception to that rule is monstergirls where the theme doesn't allow this, e.g. slime, mechanical, certain bug themed ones. Although that depends on how you look at it, if you look at it as a girl affected by monster features, than it doesn't break the rule as since the feature is slime, it then in theory should affect them completely, same goes with ghost or tech themes. However horse theme you get centaur not anthro pony, there may be a neko like version but afaik there isn't, although you can look it up on the monstergirl-pedia (yes there is a wiki of all mostergirl types).
TLDNR: Monstergirl is a human girl with a monster feature (or animal etc.), where as these are humanoid ponies, and not a human girl with pony features.