Nowhere in that article does it say that this is meant to be a system that gets airborne - the article doesn't give enough information to work out exactly what it does.
All it suggests to me is an electric motor for moving B767s around that attaches to the nose gear and gets its power from the APU. In the Air Force we used "Yellow Perils" for one man to move a helicopter about on his own. From what the article says it could easily be such a ground handling device for large jet transports that eliminates tugs. As to doing away with the use of main engines, though British LAEs seldom do it, US A&Ps and plenty of others generally move aircraft about by taxi-ing them.