Apples to apples, I wonder how much that holds true…
When a console launches, buying off the shelf equivalent parts is probably a fair bit more expensive. After a couple of years though, the latest and greatest whatever is at least two years old.
I’m sure console manufacturers flatten out these prices by making long term contracts, but still a 4 year old machine is still 4 years old. AMD has released new chipsets since that are in turn themselves coming up on 2 years old.
Granted, console games are optimized for a specific platform, but that will likely be very game specific.