I think it is a wow formula, because the formula is rnd() pasted in to a few slots. rnd() creates random numbers, so no, it couldn't have been drawn in (unless you're a spider with a long term drink problem).
The rest is careful programming to actuate Karplus Strong type synthesis.
If you think a set of random numbers sounds samey to other wavetables then I don't think anything is going to wow you
It wasn't meant as a trick btw. It was meant to show that not all formulae have to be complex to give a nice sound.