well, there may be 2 reasons to send coolant thru there; to prevent icing or it's an emissions thing.

preventing Icing up and it runs thru the iac (idle air control) to tell the ecu what RPM to run the idle at.

so basically a Utah thing(which is where the car came from, but still isn't cold enough to warrant such a mod) but he just did it anyway.

there's an argument for keeping intake air cool and dense for xtra power.

 

Questionable whether the difference could be felt in a daily driver.

 

I read once of a crack in a throttle body and coolant leaked out there. Extremely rare but maybe he was bypassing the TB due to a leak?

Makes sense.