Not only that but looks to be via tracking code used on various sites. I suspect a larger percentage of Linux users will be using ad blockers that likely block that further reducing the numbers.

The stack overflow survey puts the various Linux distros at about 58.4%* with windows at 59.72% and MacOS at 32.57% for personal use. This both accounts for people using multiple OSs and gives a much more accurate number - at least among developers. Though I do suspect these numbers will be higher for developers than the general population but 3% to 58% is a huge discrepancy.

The steam hardware survey does put the number at 1.44%, though that is extremely biased towards windows for obvious reasons. And I don't know of any more accurate ways of counting then these two. But they only show two wieldy different domains.

* wonder why they broke that out to different distros this year pushing it down the list by splitting it up 🤔 why not also report on the different versions of windows? 😒

Well, but now WSL2 with GUI seems threaten a little about Linux DE in the end :/

WSL number is quite high with dev, and sometimes I also think WSL2 is convenient because I don't need to have desktop linux to work with.

Because original is incorrect. For the first increase 0.5% to 1.5% is an increase of 200% while the increase in percentage points is 1. The reason it's important is that it can skew the readability of the statistics to a degree where the numbers at best are confusing and at worst are misleading. In your case you accidentally understated the significance of the increase.