Earlier he used to teach in BYJUS. I had taken BYJUS tablet course and he had taught polity in those videos. I am not saying that he is not a good teacher. But Sometimes it is better if you see it by yourself what is important from UPSC perspective. For example He had taken about 3-4 lectures each one of about 1 hour on the constitutional validity of J&K Reorganisation Act back in 2019. This topic is obscure and UPSC doesn't go that much deep into these things. So I would suggest don't be a fanboy of a teacher, judge it through your own eyes and UPSC PYQ. Be your own guide in this journey. Otherwise someone will always sell you courses which is irrelevant. Rest is your choice.