As you said, caveat 'entertaining' blah, blah. That said... That's actually a slightly dubious analysis. The question you need to ask is 0.02% of what? In this

As you said, caveat 'entertaining' blah, blah. That said... That's actually a slightly dubious analysis. The question you need to ask is 0.02% of what? In this case, I would take a guess it means 0.02% of all the words analyzed. As a very simple example, imagine analyzing all the letter in a book. If English were perfectly balanced, we expect to see all 26 letters at 1/26 or 0.038%, so seeing the letter 'e' appear at say, 1.0% (or even 0.1%) would be a notable statistical result.