The problem with Steam Deck is that Valve has never reported official sales figures since starting shipping its portable PC in February 2022. However, there is still some indirect data that can be used to estimate the number of owners.
The article is only tracking installs of Aperture Desk Job:
GameDiscoverCo also broke down Aperture Desk Job owners by country, using data from Steam public profiles, to see the regions with the most possible Steam Deck users. The US accounts for 26% of the total, followed by China (6.7%), Russia (5.9%), the UK (5.5%), Germany (4.7%), Canada (4.2%), Brazil (3.1%), Poland (3.0%), Turkey (2.5%), and France (2.4%).
The article is only tracking installs of Aperture Desk Job:
Lol, fools them, I played Aperture Desk Job on my Asus ROG Ally.