This is not novel. Computers have been generating mathematical information that would be resource-prohibitive to produce by hand since the dawn of computing.

The ingenious aspect seems to be that we've found simpler ways to apply computing power to a broader range of problems, which it's important to note is as much a testament to the developers of proof assistants like Lean as it is to LLM developers, to say nothing of the countless mathematicians over many centuries that contributed training data.