The article says the PS3 cost of goods was $800 per unit at launch, but it is worth remembering that the PS3 was an investment in two strategic initiatives for Sony. One was the PS3 standard, that they would earn future software royalties on. The other, and at the time maybe more important, was the BluRay standard.
The changes game developers had to make to handle cell allowed them later on to support multicore CPUs and GPGPU much easier.
Despite spinning off, GloFo and AMD remained tightly aligned businesswise, and AMD signed agreements such as minimum silicon wafer usage.
But by 2013, AMD had sold its headquarters in a "reverse mortgage" to remain solvent. https://arstechnica.com/information-technology/2013/03/amd-s...
AMD had almost a full decade without making money.
In order to make the fab seem like something someone would want to buy, AMD tied their futures into it by entering into a wafer supply agreement where they will buy certain amounts of GloFo:s production whether they need it or not.
This agreement was a millstone around AMD's neck during the worst years. It means that AMD absolutely wants to sell at least a certain amount of silicon, even at negative margin if necessary.