Can you explain why a record series A valuation is useful for YC unless they bought you out as they bought in. I would assume it means less dilution of your equity stake but I would think a record exit value (e.g. acquisition) without further funding would be the best argument for your model.
I don't think he was saying that a big Series A was good for YC. He was just offering evidence contrary to the authors point that VCs weren't investing.