If he didn't explain it, then you can presume that it's wrong. There's
nothing to discuss, and there's nothing wrong with saying "Indic
languages".
The word "Indic" refers generally to the Indo-Aryan family of languages, which does not include Dravidian languages prevalent in Southern India. Hence, bunching the entire system of Dravidian languages together with the Indo-Aryan languages in India may seem derogatory to some, and reasonably so.
Just my two cents,
Anirudh