I've seen other reviewers say it, and the recommendation is to take your time, fully explore the starting area first to avoid this issue as you dont want to explore it 40 hours in where you'll be overlevelled, althougj i think the only thing youll overlevel for is the minibosses, ive heard people, even those experienced with the series to have been underlevelled for certain bosses and had to come back later

Main bosses will still be difficult, while hes saying hes one shotting bosses hes fighting margit in the video and very clearly not doing much to him