>>nachox+Va
No, it means they buyer
thinks it is worth more than what they are paying. It doesn't mean they are right. It also means that this is the only buyer who thinks the company is worth that much, because if someone was willing to pay more, the company would be selling to them instead.
Ideally startups are about creating value, and making a return on that value, but more and more they look like they are instead selling hype to a series of investors who are trying not to get stuck with the hot potato.