It does not seem particularly
It does not seem particularly clear from the article that the Leaf is not being charged directly from the solar panels as this would mean that you would not have the use of the vehicle during daylight hours. A more typical senerio is daytime power is sold to the local utility or used to offset the electric usage at peak daytime rates. The vehicle is then charged at off peak rates at night. This is essentially the definition of net metering and may also include the discounts found in "time of use" metering. The local utility may not have these programs in place.
Such a system does have the potential of increasing the ROI of a solar PV panel system (or reducing the "payback" period) because in addition to the price of electricity being compared to the installation cost, the offset cost of gasoline might also be considered. The faux PV panels on the vehicle are a starting point for a conversation and longer explaination that must take place.