That's not the important point. Even if you have, you will still face the same problem when facing a question like, for example, say 34 × 57 = ?. The quote was using that particular problem as an example. If that example does not apply to you because you Ankified the multiplication table up to 25 or for any other reason, it is trivial to find another problem that gives the desired mental response. (As I just did with the 34 × 57 problem.)
Agreed. I'm not so much disagreeing with the thrust of the quote as nitpicking in order to engage in propaganda for my favorite SRS.
Another monthly installment of the rationality quotes thread. The usual rules apply: