you can interpret it anyway you want
I am basing my comment on my own personal experience...
a couple of years ago,azvinnie and myself got a ticket from the local PD
the municipal judge asked specifically if we could shift (I showed him on my bike by pulling the lever cover off),he was very thorough on his checking my ride (I think he was interested
he took 4 days of researching and set a local precedent saying we WERE legal motor-assisted bicycles
(a 4 page written decision)
I carry a copy with me in my tool bag