C9 is indeed a superteam, same with Fnatic and possibly Team Liquid
I mean, there's xeppaa, vanity, and leaf. There are definitely better players than those three (hell there's even an argument to be made about zellsis). So I kinda agree, I wouldn't exactly call c9 a superteam.
Superteam is like Faze 2017 roster in csgo, or G2 2019 in league, or Miami Heat in 2010, just because there's yay on the team that doesn't mean C9 is a superteam.
Even though I hate to say this but I kinda agree with R*ddit 🤮