seeded teams in NA

I read somewhere that C9, GUARD, OPTIC, and XSET were all seeded into groups and are not playing the open bracket.
Does anyone have confirmation on this? I wouldn't be surprised if that was the case but I haven't seen it from a credible source besides none of those teams being listed on battlfy

Team secret qual masters 2 ez

Its probably true as they were the top 4 from last challengers and it was done with 100T, SEN, Optic and C9 i think for challengers 1

yes its true trust me bro

https://twitter.com/purest/status/1509685195519135756