Too bad. Sleeves would have been cheaper, quicker, and proven. In a small engine such as this, the weight savings is not even a factor.
Did someone feed you this line of BS or did you just make it up?
PTWA provides a lower cost and lower weight alternative to cast iron liners, while delivering increased displacement in the same size engine package, and a potential for better heat transfer."
From an engineering point of view not only can the engine lose weight by eliminating the iron liners but EM also has the opportunity to cut both weight and cost by making the block smaller, for the same displacement, since they no longer have to include extra space for the iron liners.
Weight may not matter much to the engine itself however it is a huge factor in such a light car. They are trying to get maximum fuel economy so cutting even 60 lbs of weight throughout this small car could mean reducing overall vehicle weight by 5% which really adds up in fuel economy.
By the way 5% of 1200 lbs is 60 lbs which is where those numbers came from.