Did you look at the tomato-slicing video in the answer?  Even if the many, many upvotes came because of the first test mentioned (slicing a person), the tomato-slicing video validated the answer, made it worth keeping, and elevated it far above the two deleted answers.

The OP asked for a simple test, and the answer provided a simple, inexpensive test with a video demonstrating the test.  The only hard part for most of the year would be finding a ripe tomato; slicing a supermarket tomato would prove little.

**In response to the comment of @Gabriel C**:

> Yes, but then if you get rid of the useless paragraph and image, the
> answer becomes a one-line answer based on an outside link video, which
> again isn't what is usually considered a good answer.

Several of the answers provided **less** evidence than the tomato-slicing   video.  If this answer is to be deleted, those should be also.  Moreover, I'd rather test the knife on a ripe tomato and keep the knife away from my hair, or a finger, or even a fingernail.  Actually, the video proved to me that I **don't** want that knife in my kitchen -- **too** sharp!