Prices are decreasing much slower now. At this pace, large scale energy storage for replacing stable energy sources like coal and fission power plants is far out of reach.
If you look at the beginning of the chart, the price decrease (from $780 to $258 in 2017) over the same four year period was 67%. And for 2023 it was only 24%. So progress has slowed a lot. In 2022 there was even a year-over-year price increase. That's bad news when you want to build massive energy storage systems that can replace power plants.
I'm saying that prices are falling increasingly more slowly and that using solar+batteries to replace coal, gas and fission power plants will probably not happen.
Your linked source shows the price in the last 4 years going from
cell: $128->$107
Pack: $55->$32
Real: $183->$139
So the price has dropped 25% in the last 4 years. That is NOT relatively stable by any definition.