Just peeped that chart it’s funny how it said this.
Total available certified units: 317.3 million
US: 259.84 million11
UK: 34.4 million14
CAN: 7.8 million17
Just comparing these 3 together the numbers are interesting.

Eminem was the best selling male artist of the 2010s decade based on album and singles pure sales, not streaming and units.
Taylor was the best selling artist having sold over 90 million records by the end of 2019.
The best selling artists of the 2010s decade, in order, are as follows:

1. Adele
2. Taylor
3. Eminem
4. Justin Bieber
5. Drake

These are US sales

forbes.com/sites/bryanrolli/2020/01/10/eminem-was-the-bestselling-male-artist-of-the-2010s/#3800d7c82b18

Chartmasters also did a best-selling artists of the decade and Drake came in at #2 behind Adele. They actually list him as the best-selling male artist of the 2010s and they include streaming and worldwide sales. This accomplishment is still amazing considering he doesn't have any of the top 10 best selling albums or singles of the decade, which shows his incredible consistency. Adele's total units were based very heavily on pure sales, though.

chartmasters.org/2020/01/best-selling-artists-of-the-2010s

EDIT: The Chartmasters count only includes releases during the 2010s. So no MJ material, Elvis, Beatles or any singles and albums released before 2010 are included.

Drakes damn there already doing eminem numbers

Piracy existed back when Eminem was releasing. Napster was still going strong and it wasn’t even deemed illegal yet.