Thanks very much for the question. Your correct, the root note there is meant to be on the 9 hole blow, not 10. I’ve just fixed the pdf, so it reads correctly now.
The rest of the document was correct, and the 10 blow bend is included for future reference.
Blow bends are covered in Step 16, at which point you will be able to add the 10 blow bend into your blues scale, and playing.