it first looks at map differential, but because RRQ and NS have the same in your case, it goes to round differential which gives RRQ the top spot
after that T1 and TLN is decided by their H2H because it's only a 2-way tie then
In 4 way tie
Zeta #1 if Zeta win 2-0 and RRQ lose 2-0, map diff +3 vs +2
NS #1 if NS win 2-0 and RRQ lose 2-0, both get dominant result and NS need to win round diff which is extremely difficult