He had the most subscribed and most viewed youtube channel in the world between 2013 and 2017. I think it’s fair to call the most popular person on one of the most popular online platforms one of the most influential people, and if you were online in any mainstream capacity during those four years I think it’s a fair assumption that you have heard of him, even if that’s not the case here.
Looking over this list of books (https://www.goodreads.com/list/show/121751.Pewdiepie_s_Literature_Club_) he has discussed, it seems most of the philosophy he has discussed is pretty standard stuff. Plato, Aristotle, Nietzsche. At a glance the only problematic thing I see is Jordan Peterson’s book, 12 Rules for Life. If you were worried that he was discussing problematic ideas, why not look it up instead of just casting doubt?
Frankly, disagreement is not the basis for philosophy. The basis for philosophy is a love (philo) of knowing (sophy). Being critical of your own thoughts and the thoughts of others can be a valuable tool toward improving or refining one’s knowledge, but things like practice, observation, and curiosity are arguably even more important for learning new knowledge.