This is an excessive overestimate by not carefully considering the known types of afferent (incoming) fibers and their average firing statistics (most neurons f

This is an excessive overestimate by not carefully considering the known types of afferent (incoming) fibers and their average firing statistics (most neurons fire sparsely). See the comment on that thread by "JohnShaft" who noodles a better estimate of around 200MB/s (incoming) by taking anatomy into account. The motor efferent signals are going to be a lot lower bandwidth still...