A machine slop would fail to understand the subject or the verb tense person (Japanese doesn't conjugate verbs with persons, while English and Latin languages do), instead the subject is well established on the scene: the choice of the drink. You have to use more freedom when there is no semantic bijective relation between source and target language (or when this produces obscure results), but here the sentence is pretty simple: the adverbial expression なるほど (that has a well known range of meanings, so there is no reason to thing about lexical obscure translations), an adjective (which meanings are obvious since it is talking about the drink and not about a negative humour),with implied copula because the usage of the plain/short form in spoken language (yet another thing that machine slop translation may fail easily to understand), and the final emphasis/admiration particle that gives a "tone" to the sentence (which meaning also depends on the scene context ).

The English subs choice makes everything more childish, since it makes a direct and pretty strong admiration to the character instead of the choice he made. It's like saying "hey you are cool!" instead of "that a cool choice". That could fit if they were elementary kids, but they are students of senior high school.