Don't they say in the article that it is also for scaling up power and datacenters? That's the big cost here.
There's the servers and data center infrastructure (cooling, electricity) as well as the GPUs of course, but if we're talking $10B+ of GPUs in a single datacenter, it seems that would dominate. Electricity generation is also a big expense, and it seems nuclear is the most viable option although multi-GW solar plants are possible too in some locations. The 1GW ~ $10B number I suggested is in the right ballpark.