If thorough testing and 100 experts can’t find a problem, the thing is probably perfect.

If you can get 100 experts to agree on something then you've cracked a much harder problem than software quality.

Agreed. We cant even get 10 dentists to agree which toothpaste to use. Getting 100 experts to agree on anything is a miracle.

Presumably, this is why the next paragraph opens with "Perfection is impossible."

So, if 100 experts can’t find a problem, the thing is probably perfect. Unfortunately, this will never happen, because perfection is impossible.