Don't worry, it doesn't work.
Basically, while the structure of the network has been known for decades, they don't yet have the technology to figure out how the neurons behave (the weights of the neurons) nor how they learn (changes in the weights), so they can't "upload" data from a real worm.
But isn't referring to not knowing "the weights" (as the article and researchers do) making a rather large assumption about the nature of the problem? It sounds more like the researchers don't know "why the neurons fire when they do", which would leave open the question of whether "weights" is even a sufficient model.