Good find! Not that the news is all good. As you point out, however, one good news point is that a 240V 50A RV type plug does meet code for level 2 charging.
The biggest surprise to me is that a level 1 connection (120V 12A) with a plug to an ordinary wall outlet is still classified as an EVSE. I expect to average less than 30 miles/day in my Leaf, so have been planning to use level 1 charging. I now see that I need to keep a sharper eye out for restrictions that apply to all EVSEs.
Case in point: the interrupting device built into the cord must be either in the wall plug or no more than 12 cable inches away from it. So much for using an extension cord. You say you live in an apartment with parking behind the building? Sorry, no cords allowed out a window and down to the car. You're visiting your kids and parking overnight in their driveway? Sorry, you'll have to kick their car out of the garage. Nissan recommends that 120V charging be reserved for trickle charge "opportunity" use, but for most of the "opportunities" (read emergencies) I can think of away from home you're going to need an extension cord, so you'd better keep a sharp eye out for the electrical code police.
At the other end of the scale, if you have some extra dough and were dreaming of installing a level 3 charger (only about $15,000!!) for the convenience of your MyNissanLeaf buddies when they come through town, you're also out of luck. Only level 1 and level 2 charging is allowed for personal use.