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.
Android is not Linux. It uses the Linux kernel and that’s it. You can’t install Linux applications on it.
And laptops are also mobile devices. Not much difference between a laptop and a Steam Deck.