I would like to think the child is missing the bonding and fun the two of you enjoyed with the robot guy. The child may be missing the experience of being with you and the robot guy. I would look for more activities you can explore with the child.
We already know how well people are deceived by text and images. Imagine if they're getting phone or video calls from "people" who keep them company for hours at a time. Imagine if they're accustomed to it from an early age. The notion of dealing with a real, messy, rough on the edges, honest human being well become an intractable frustration.