They claim their simulation moves in a "zigzag" pattern that's qualitatively similar to the real animal:

> During locomotion, the input of sensory neurons exhibited fluctuations due to the zigzag movement of the body’s head (Fig. 5c). The membrane potentials of each individual motor neuron also oscillated in response to the sensory input, especially the head motor neurons (Fig. 5d). The activation of muscle cells revealed traveling waves from the head to the tail (Supplementary Fig. 4), accompanied by alternating contractions and relaxations of dorsal and ventral muscle cells (Fig. 5e). These findings resemble observations in biological experiments