Fast climber system is completely broken and does not work as intended

https://op.gg/lol/summoners/eune/TheWeebsSlayer-EUNE/matches/5oCWDPZ5nucUVHc3YmSO3orSUw0_dLM1vanXCr63N5A%3D/1772466564000

https://preview.redd.it/9vp15g2dnnmg1.png?width=1333&format=png&auto=webp&s=9f94c146868a7eb51c66174d7e9be0cbb7d08a41

Silver1 with 39% wr is able to play in platinum/emerald lobby. You are not allowed to play with D4 when u are E3 but it is ok to play with silver1. How is it even possible to be fast climber when you have 39% wr?