The numbers in the blog post seem VERY inaccurate.
Quick calculation: Input pricing: Image input in 2.0 Flash is $0.0001935. Let's ignore the prompt. Output pricing: Let's assume 500 token per page, which is $0.0003
Cost per page: $0.0004935
That means 2,026 pages per dollar. Not 6,000!
Might still be cheaper than many solutions but I don't see where these numbers are coming from.
By the way, image input is much more expensive in Gemini 2.0 even for 2.0 Flash Lite.
Edit: The post says batch pricing, which would be 4k pages based on my calculation. Using batch pricing is pretty different though. Great if feasible but not practical in many contexts.