Well, I'm not sure that

It is too soon to know if he can stop taking the medication completely, but the dosage is greatly reduced. And he is well enough for the team to start planning to discharge him home from the hospital. He is meeting developmental milestones and his weight is now in the 40th percentile for his age, but it is not yet known if he’ll be spared a liver transplant.

counts as "healed." (emphasis mine)

This certainly sounds like a promising medical advancement, and the article goes out of its way to point out the extent to which federal funding made it possible. But the hed oversells the current state of affairs.