It’s power levels extrapolated from regional and international records. All of the Americas teams from 3rd - 8th were competitive during stage 1 and could easily have placed as well as LEV at Shanghai. By contrast EMEA and Pacific are intra-regionally very top heavy.
Teams to consider in Pacific are T1, DRX, TS and Talon. DRX was the most dominant in stage 1 but lost to PRX and GenG in playoffs (unlucky). The others are too inconsistent for me to accurately rank.
In EMEA, only NAVI and KC have a case from which the former was eliminated by peak TH in playoffs despite looking dominant all of stage 1. KC has a severe adaptability issue that would result in them being slapped around internationally once their non-standard comps have some footage out there.
China only has FPX who nearly beat both GenG and TH in BO3s. I have no faith in EDG.