It’s because articles about a 7% improvement in battery capacity aren’t as exciting, but those have been happening every year and the results compound over time. Eg check out this graph:

https://rockymntstage.wpengine.com/wp-content/uploads/2024/01/slide-2-battery-charts.png

I can go on amazon right now and buy a 1kWh battery for close to $100 which is crazy cheap compared to even a couple years ago