> What do they mean by "introduce sustainable vehicles practically"

For example, this vehicle will be part of Toyota's Welcab line that offers factory-installed conversions that makes driving accessible to people in wheelchairs. Including a device that will lift your wheelchair up and store it on top of the car while in motion (https://commons.wikimedia.org/wiki/File:The_rearview_of_Toyo...).

Tesla by comparison leaves this up to aftermarket accessory designers to figure out.

They are truly thinking about the "how does everyone drive an electric vehicle" problem.