It had to have its momentum wheel spun up so it could move high enough before it could deploy the lightsail.
One: Was the leccy for the wheel supplied by battery or solar panel?
Two: How does a momentum wheel enable a change in orbit? Is there a reaction-mass thruster we have not been told about here?
Three: Lightsails are not solar panels. Go on, be honest, where does the onboard power really come from?
Four: No longer moving fast enough to sustain orbit for more than a year, it deploys its lightsail. This will be used to check basic system functions, presumably steering effects, but cannot prevent orbital decay. That is hardly "powered by", either, just another manoeuvring thruster. (a boost from LEO to escape velocity would have been expected under that monicker, and would have equally de-cluttered the neighbourhood.)
"Lightsail-assisted" is what we are really talking about here. Roll on LightSail 3, I say.