I believe the complete opposite. If someone is willing to buy your business, no matter the amount, it’s because it’s worth MUCH more than what they’re paying. It’s illogical for them to pay less than its real value. It’s even illogical to think they’d pay exactly what it’s worth. Why would somebody bother buying a company if they were only going to break even?
If you sell your business, it's because the value of the business to you is less than the purchase price. Likewise, the value to the buyer is greater than the purchase price.