They say "Each brain relay is connected to its target organ by sympathetic and parasympathetic nerves."
I'm not aware that any direct connection of cortical regions to organs via sympathetic nerves could be shown to exist. [https://www.mussenhealth.us/cerebral-cortex/autonomic-nervous-system-effects.html|This article] describes the working of the sympathetic and parasympathetic nerves. 
In lesson 4 we discussed the cascade in a UDIN, via the amygdala and hypothalamus.
However, our observation as Practitioners is that we can access our organs and even specific tissues by mindfulness and imagination. So we know that the mechanism exists, and can leave its details to research to show ;-)
Some interesting studies have been done on identifying emotions in the cerebral cortex [https://www.kurzweilai.net/identifying-emotions-based-on-brain-activity-and-machine-learning-techniques|here].