How are drx and prx qualified for champs already?
No, the emea team that finishes lowest of the 4 emea teams at Tokyo will have to play LCQ. You get points for placement at Tokyo, even if you finish last, so Americas and Pacific sending 3 teams, guarantees that those 3 teams will earn points, where the rest of the teams in those leagues can't earn points, so they are making champions. Emea sending four teams, means that the team with the lowest points (the worst performer) will have to play LCQ with the other emea teams, since the first 3 direct slots to Champions are taken by the teams with more points.
They made the upper finals of the playoffs bracket. Whoever wins goes to the grand finals and is guaranteed a minimum of 2nd place. Whoever loses drops to the lower finals. Whoever loses the lower finals is the 3rd place team. Whoever wins the lower finals goes to the grand finals and places minimum 2nd.