Releasing more older AM4 CPUs will just have the same effect on DDR4 prices, greed drives every breath in this world. Retailers don't give a rats left nut about keeping prices cheap. There's no money in cheap products in the western world. More expensive garbage products is what North America is all about. As retailers see a shift to older hardware, prices go up, regardless of supply and demand
The price of Zen 3 CPUs has increased dramatically over the past few months. Despite being old, desktop processors like the Ryzen 7 5700X are now sitting quite a bit above their record-low prices. This means that customers are buying old AM4 CPUs with DDR4 support as a consequence of the ongoing DRAM supply crunch.