This could be wrong, but https://tracxn.com/d/companies/mill-computing/__5BCN3HKJOoke... says they raised US$100k in debt, and https://www.crunchbase.com/organization/mill-computing-inc says You Have Been Blocked but apparently told Google they were pre-seed funding. https://pitchbook.com/profiles/company/169749-55#funding claims that they raised US$3.2M (US$1.2M in angel funding in 02004 and US$2M in a seed round in 02016).

Even in 02016, I don't think US$2M was enough to tape out a silicon prototype of a working high-performance CPU. MPW ("shuttle") programs can give you working prototypes for as low as US$3000, but only in process nodes a decade or more behind the state of the art. US$30M is a much more plausible budget.