I've always thought TEDx were entrepreneurs/inventors hawking their own stuff anyway, so I never bother watching any of their videos. This example just made it more obvious that TEDx is mostly a waste of time.
The most important thing about this story is that in -- checks -- Croatia, there isn't a single bigger event that is as accessible to the author as TEDxZagreb.
TED will get involved, but they will protect their brand. Not smart Croatians.
Regarding the "just" in your sentence, it seems to be more responsible to let the TEDx organizers know first, as he has done, in case it was a mistake. Contacting TED now makes sense.