This still means that the team from the winners bracket has something of a freebie in match 3, where, even if they lost the first two, they should be able to use the extra 20 bans to force a match 4, but at least the decider should be fair-ish after that.
If the “deathmatch” match occurs before no 4 for either team, the team from LB will face off against Team WB with only 10 win-bans, while Team WB will face a Team LB with 20 win-bans. It’s still kind of a double-disadvantage for LB.