Even though maple syrup does contain some nutrients and antioxidants, it is also very high in sugar. Calorie for calorie (and sugar gram for sugar gram), maple syrup is a very poor source of nutrients compared to “real” foods like vegetables, fruits and unprocessed animal foods.
Replacing refined sugar with pure, quality maple syrup is likely to yield a net health benefit, but adding it to your diet will just make things worse. Maple syrup is a “less bad” version of sugar… kind of like honey and coconut sugar. That does NOT make it healthy.
Same as with all sugar-based sweeteners, if you’re going to eat it, make sure to do so in moderation only.