Yes, it's complete nonsense. We don't develop a hive mind with parasites, or merge consciousness in any way. Can't believe anyone would even suggest such nonsense.
Surely what he means is that we will make poor choices based on what the microbes/pathogens require to stay alive - rather than the microbes literally taking over our minds. For example it is well known that a yeat overgrowth will cause sugar and carb cravings as the yeast requires a high sugar diet to thrive. But yes i agree - maybe he overstates it - its not as if microbes have brains!
Justy.