As a lay-person, it seems kind of light on details and a bit fanciful. The article states they created pancreatic islet seed cells, but fails to link how exactly this cures diabetes. (I’m assuming these cells create the insulin.)
Another point is this seems to fly in t he face of what we’ve been told for decades, that diabetes can now be cured and not just managed. (I personally don’t have a problem with this, everything is impossible until it becomes possible.)
The biggest issue I see is that this cured one person. Diabetes is a fairly common condition, they shouldn’t have had a problem getting more participants in a study.