That article is about emissions, not admixture. If you look at the source of that article, which they link to: https://carbonmonitor.org/variation

First off we can now look at the full year instead of 6 months of data, its no longer US +4.2% and China -2.7%, its US +2.0% and China -2.3%

China's 2025 YoY emissions decline is almost all due to a decline in industry, not power (1.8% of their 2.3% decline, in other words, most of it). It's understandable to have a lower year if you have an economic slowdown. Russia also had a decline, not for green reasons.