So, these statistics apparently come from StatCounter, a web analytics company. I know that this is probably the best way of collecting usage metrics for the entire Internet, but I think this is less efficient for counting Linux users - after all, I would say that the proportion of Linux users who also use content blockers is pretty high. Even if it weren’t the case, most distributions ship with Firefox pre-installed, which automatically blocks trackers out-of-the-box.
Also, wouldn’t this also count an embedded device with a WebView as a “Linux user”? For example, smart TVs have a web browser, and typically identify themselves with a “Generic Linux” user-agent.