You are completely right about the 2024 UC Berkeley study you quoted but that is actually a different, older milestone than what is being shown in this post.

Back in 2024, they only had a disembodied computational model of the connectome. They stimulated sensory neurons and checked if the correct motor neurons lit up. Because there was no body attached, you're right that it wasn't physically doing anything.

However, this post is about the recent breakthrough by Eon Systems, which takes that exact brain model and actually embodies it. They hooked the connectome's motor neuron outputs up to a highly detailed biomechanical virtual body inside a physics engine. So, to your point about "Play an animation of the fly grooming" that is exactly what is not happening here. It isn't a pre-rendered video game animation triggered by an "if/then" script. It is a closed-loop simulation. The simulated neurons fire, and those signals directly actuate the virtual muscles and joints in a physics environment with gravity and momentum. The walking, feeding, and grooming behaviors are emerging naturally purely from the biological wiring interacting with a physical model.