They do need to hook up the arteries though. Actually get some O2 through the lung. Still, all in all pretty cool.
Reading the article, that's next on their to-do list. Looking at what they mentioned for previous tests, I can see why they didn't hook the pulminaries up, because previous tests had failed to implant and survive, much less work. So why do the longer, more expensive and dangerous surgery to hook them up when, by the sounds of it, it succeeding this well was shocking to the researchers involved?
So now they've shown that they can have the organ survive in the body for a significant period. Next step, test usability.
Having a pig live for 10 days, 10 weeks, or ten months with a cloned lung inside it that's not doing anything doesn't (IMHO) prove much of anything other than that a pig can live with one lung.
Your opinion isn't very humble, or very accurate. Previous tests had failed catastrophically, killing the subjects. That the subject didn't die, that the grown lung still looked like a lung, and otherwise didn't die and turn into a huge infection, as well as still having the various structures to exchange O2 if the appropriate blood vessels were hooked up was all new.
Hell, that the messed up lung didn't mess up the other lung is also good to know.