

The stats are from StatCounter which has this in their FAQ:
What methodology is used to calculate Statcounter Global Stats? Statcounter is a web analytics service. Our tracking code is installed on more than 1.5 million sites globally. These sites cover various activities and geographic locations. Every month, we record billions of page views to these sites. For each page view, we analyse the browser/operating system/screen resolution used and we establish if the page view is from a mobile device.
So it’s the percentage if web traffic (to sites that use this analytics service)
I’ve been running sid (unstable) on my htpc for almost a year now without any problems (wanted Debian, because that’s what I know, but also wanted HDR support, which came with plasma 6, wichich was only in sid). Just as stable as Bookworm so far (anecdotally).
I’ve actually been thinking of moving my main desktop from mint Debian edition over to sid as well.
Sid is even one step more unstable then testing, so testing should be no problem either