all i can say is, boom relies on teamplay, but often play too passive which make them choke sometimes, need to prove they can do better. On the other hand, nongshim has been relying on raw talent aim and mechanical play when neon was op, which make them also need to prove they can keep up with T1 team.
those tierlist are just preview from performance of team in T2, that somehow compared to T1 team's performance (which is most of the time not valid). Just take it with a grain of salt