They called it the main qualifier, but that one was part of the major, every team would get stickers. And I think they do the same system again, seeing how they divide the slots into challenger,contenders and legends again.
Challenger and contenders play a 16 team swiss format, the 8 teams that qualify through it join the 8 legends to play another 16 team swiss format which leads into a 8 team single elim playoff bracket
Also Liquipedia shows a single elimination playoff bracket liquipedia.net/counterstrike/PGL/2021/St..
Thats alot of faith in teams like 00nation and DBLP to do really well especially against the bigger teams. Also I would be surprised if NIP goes that far into the playoffs. I know they have the ability but they haven't showed it with results so far.
I'm like 80% sure Navi will win major this year. There's not much weakness on them. Navi right now either s1mple play like a god or everyone show up. Both version is scary af. Only a great tactical team like 2018-2019 astralis who can stop this Navi.