Well, Harlequin still remembers how to step bodily into the astral, and travel that way. May seem like teleportation, since he can get from one side of North America to the other in astonishing time, but it isn't. Just like a sufficiently high force Levitate spell isn't the same as teleportation, even though you may be there one second and gone the next. They're firm on the 'no teleporting' thing, since teleporting is instant transmission from A to B. Even the case of spirits jaunting to their metaplane and back takes a couple full actions, I believe, so still not an instant thing.