"Neha's cow is bigger than my cow."
Translation:नेहा की गाय मेरी गाय से बड़ी है।
I'd disagree. I think it's a great way to learn. And anyway, there can't be a separate lesson for every single thing. So Duo has to introduce it somewhere. I think it was very well done here, considering this mini-lesson/sub-lesson on comparatives isn't hard and can be understood on the spot.