30B investment for "hundreds" of US jobs seems like a weird number to brag about
Think whatever you want about them, whether they're good or bad when it comes to environment, public health etc.
But one thing cannot be ignored - that they are not built to employ some large swath of people. They can be run with very lean teams, much leaner than the average person thinks for something so large. Any claim that they are employing some measurable amount of people is a sham they try to push onto the public.
This is still just making parts of an AI server rack at TSMC Arizona or Intel or Samsung fabs on US soil. Broadcom was likely going to do this anyway.
This is what technology does: More output for less labor input.