Agreed this is not brain uploading. Actually this research is not that much different from what has previously been done in computer simulations. The advance is having embedded it in a physical substrate vs a computer.

However, are you implying that C. elegans uploading wouldn't count as uploading because it's so much simpler that a human brain? If so, I disagree with you there. A lot of people think that it would be basically impossible to encode preferences from a C elegans organism (eg learned patterns) into a computer. It certainly hasn't been done yet AFAIK. Doing it would be a conceptual advance and would allow us to tweak our models of how certain types of neurons, electrical synapses, and chemical synapses work, inter alia.

Also, whether you call the C. elegans nervous system a "brain" or a "ganglia" is a question of semantics. Many and perhaps most researchers do call it a brain, see eg here.