Not reading this whole thread so it probably could have already been mentioned, but you could have simply checked how they came about that list:
It's based on how many top 100 hits they have, purely numbers. Drake is at #11 right now:
"Meanwhile, The Beatles defend their No. 1 ranking on
Billboard‘s Greatest of All-Time Hot 100 Artists chart (among close to 8,000 acts ever to appear on the weekly Hot 100). The icons, who also led the 2008, 2013 and 2018 all-time iterations, boast a record 20 No. 1s on the weekly Hot 100, among 34 top 10s, the most among groups.
Madonna, with 38 Hot 100 top 10s, the most among women, ranks second on Greatest of All-Time Hot 100 Artists, followed in the top five by, at No. 3,
Elton John, currently at his highest rank on the weekly Hot 100
since 1998 with “Cold Heart (Pnau Remix),” with Dua Lipa; at No. 4,
Elvis Presley, even with his career having predated the Hot 100’s inception by two years; and, at No. 5,
Mariah Carey, who leads all soloists with 19 Hot 100 No. 1s, through her latest, “All I Want for Christmas Is You,” her 1994 carol that jingled to the apex at last
in 2019, and
leads Billboard‘s new
Greatest of All Time Holiday 100 Songs chart.
While the Greatest of All-Time Hot 100 Artists recap’s top 10 mirrors that of the 2018 tabulation, Drake jumps to within the edge of the tier, bounding from No. 22 to No. 11.............."
The Weeknd & The Beatles Top Billboard’s All-Time Hot 100 Charts – Billboard