These tests are interesting but I can't help feeling that these are benchmaxxing results. "We made our harness make sqlite in rust" sounds like a much easier probelm statement than having to recreate an application like facebook. I think the concept of having to integrate is the real challenge. Re-writing code in new languages based on decent docs is a difficult but less useful measure of how AI can help replace engineers.
Imagine this: you need to build a new CRUD app but your AI agent spends 20M toks on just writing it's own custom login function, that's a waste of time and money. I would not like to have a new system developed for me in such cases. I think we need a test where the agents are more specifically tasked to find technologies worth integrating and hence write the fewest lines of code.