Not necessarily. HLTV doesn't use a "Top20" filter for the cover page rating. They choose all relevant Tier1 events as the filter for ratings. In that, ZywOo is like 0.05-0.07 higher than sh1ro/Hobbit/Ax1le.
However, ZywOo has half as many maps as them (reason why Stavn and BlameF were lower-ranked in 2020, even with high rating and multiple events victories). Basically 3-4 playoffs appearances in total, and 2 semifinal+ finishes after 9 months. Not to mention 0 MVPs + 0 trophies, barely a few EVPs. His playoffs rating also would be kinda insignificant, because he's played very few playoffs maps, several times lesser maps than Gambit. Also, bombed out last-place many times.
In Contrast, Ax1le/sh1ro/Hobbit's ratings are for actual important playoff matches, rather than group stage ratings. That's because Gambit made 9-10 total grandFinals, won 7 events, 5 big ones, including Katowice, have many MVPs, and EVPs for almost every event. In addition, all of these stats after double as many maps as ZywOo, and on playoffs.
As for 2019 s1mple, Navi made playoffs of literally EVERY single event in 2019, including the majors. They had 8 Top3/Top4+ overall finishes, 1 victory. s1mple had 1 MVP + 5-6 big event EVPs, including Major EVPs. In addition, s1mple's rating on big events and higher opponents was even 0.10 higher than device. So, it's not the same case, yet. These last 3 months can change a lot for ZywOo and Gambit players.