That is correct, DDR5 today is in real US$ slightly cheaper than DRAM was in 2011, 15 years ago.

For more than 15 years in the past, the price in real US$ of DRAM per GB was always higher than today.

During 2014, there was a brief price peak when DDR3 (the standard current then) was slightly more expensive than DDR5 is today.

Still, the fact that now the price per GB is the same as 15 years ago, is bad enough, and it can still become worse.