Funny you asked, because I was just pondering the exact same question.
The championship points system is REALLY confusing. From my understanding, there will be a regular playoff just like before that will determine the top 6 teams. The winner of the playoff at MSG, gets a spot for Worlds. The 2nd place point holder after the playoff, also get a spot.
Suppose CLG finishes 2nd, and TL finishes 3rd in the summer playoff, TL (50+70) > (10+90) - TL will go to worlds based on points.
Now there is ANOTHER tournament to determine the 3rd seed. The tournament takes the 5 teams with most points. This means, EVEN if C9 finish last this split, they are guaranteed a spot in this tournament (because they have 70 points already).
So really, this split/playoff really doesn't matter that much for C9. They got plenty of time to improve.