This graph shows the market share of desktop operating systems worldwide based on over 5 billion monthly page views.
It peaked at 4.05% in March. The last 2 months it went just below 4% as the Unknown category increased. For June the reverse happened, so 4.04% seems to be the real current share of Linux on Desktop as desktop clients were read properly/werent spoofed.
no, the statistics are based on browser agents, very few steam deck users browse the Internet on their devices. it's also only half the Linux devices on steam, not of all Linux desktops
Source is the Steam hardware survey set to show Linux data only. He forgot to mention the statement is only true for Steam Gamers, not for all of Linux desktops outside of Steam.