A quick glance at sold DIMMs on ebay makes clear this is just nonsense. What's the source for these numbers?
This is just some vibe-coded crap, isn't it?
They seem pretty similar to the values from pcpartpicker. (https://pcpartpicker.com/trends/price/memory/)
Probably not tracking eBay but retail stores..
I checked the prices for 64GB DDR5. There's some variance based on brand/model but the average and trend seems more or less right. Did you happen to notice that it is about prices in the EU?