It makes sense. If he got there quick, his product was working, and it had a chance at gold. Ultimately, lots of ways for startup to fail and failing-to-scale is one of them.
Well, he knows there's PMF at a small market now. He can try again without the large raise if he wants to run a lifestyle business.
But that makes this whole thing pretty circular—they only would have $100MM valuation because they sold a story of growth to investors. Assuming that the round at $100M valuation was during the boom times of 2019-2021, that could have been with as little as $3-5M annual revenue (20-25x multiplier).
Assuming slow or no growth, a company with $3M in revenue would be worth <$15M.
You are right: low 7 figures = $3-$5M annual revenue