I watched the keynote like everybody else and heard exactly what Kevin Lynch said at 1:25:57 of the video.
I watched it before posting. He said exactly what I said:
"While you're walking, Apple Watch will give you taptic feedback on each turn, so you'll know when it's time to turn left, or to turn right. And those feelings are different for each direction."
Your proposed long-short code is a much or more of a fantasy as the blogger's.
It fits what he said. Others think so too. E.g.
"...the Watch will know where you are, and vibrate when it's time to turnone kind of buzz for left, a different one for right."
Apple Watch's Walking Directions Buzz Your Wrist When It's Time to Turn - Gizmodo
I simply don't believe that Apple will resort to something as unintuitive as a primitive form of morse code to communicate direction in maps when they have featured it so prominently.
It makes a lot of sense to use different vibrations. I'm not convinced that the top of the wrist is sensitive enough to tell apart taps that are likely less than an inch apart.
The listed patent was filed almost three years ago, perhaps by now Apple has enhanced the linear actuator such that it is mounted horizontally and the tap rod extends to surfaces at both the left and right sides of the Apple Watch. Time will tell.
It doesn't appear to extend that far, and is in fact off-center:

In either case, we'll soon know. Regards.