The key word in the article is "again"

'Valve correcting again the Steam China numbers.'

This seemingly is a common problem with the Steam Hardware Report, with Chinese users being erroneously represented. It constantly gets fixed, although takes a bit. It could be the hardware surveys are sent out at a different time compared to the rest of the world, then combined in the following month.

This is proven by "Ended 2025 at around a 3.5% marketshare, dipped a bit in January, and fell to 2.23% in February."