That's the conclusion I tend to reach, and I believe Google to have fraudulently described a rental as a purchase. Whoever is the source of authority to run software on a device is the owner of that device. Since enabling remote management does not require administrator privilege, the right to do so doesn't come from the administrator. Since disabling remote management cannot be done by a local administrator, the granted authority is even greater than the nominal authority granted to the buyer. Each of these implies that Google remained the source of authority, and therefore didn't transfer ownership over the device.
