I completely agree that leaving out the gut-brain connection may be a huge error in our quest for General AI simulation. I'm not sure that I agree that simulating neurons in silicon form is equivalent to restoring the antenna though. There may be a quantum link that only neurons have functionally.

They are already finding quantum effects in plants:

https://horizon-magazine.eu/article/vibrating-molecules-help...

And that our brain contains micro-tubules that exhibit quantum effects:

https://phys.org/news/2014-01-discovery-quantum-vibrations-m...

Maybe they ARE the antenna.