Dan Vs People That Can Speak But Don't Do It Right.

So Shark Tank was on the tele.

An old man who happened to be a veterinarian had a product that helps prevent a bunch of diseases in animals. The man states that he has had no cases of these diseases in his clinic  in the past forty years - since he has been making and distributing the stuff.

One of the sharks - the young white guy - says no.

Wait what.

How would this shark know whether or not the old man has had any cases of these diseases in his practice? The veterinarian would know. He ought to, it is his  practice.

It might be that this man has had no patients in the past forty years, or that he has only seen a rabbit and a mouse or he deals with turtles that live far longer than that or that there is another vet in town that deals with those diseases.
It doesn't matter. The claim is that he has had no cases of those diseases in his clinic -- with any or all of the above events, this could be completely true. None of the above suddenly change the fact that he has not had a case of those diseases in his clinic in the past forty years.

What the shark meant was "These claim are outlandish, I refuse to believe them without sufficient evidence". What he said was "You have not gone forty years without one of those diseases in your clinic".

I agree with what he meant to some extent, but I do not agree with what he said.