I found this information in Appendix C "Basic Strategy for Single Deck" (p.161). May lists the following under "when to draw" for "Hard Hands"

"Draw to 11 vs. all"
"Draw to 12 vs. 2 or 3"
"Draw to 16 vs. 7-10"
"Draw to 16 vs. Ace"

May would be in step with your thinking if he had said "Draw at 16 vs. Ace. Could this be just a typo?

Artguy