He gave a talk on it at Clojure West 2015 .
kinda funny: Visual Studio project. Excel on Windows. "__MACOSX"-folder in .zip-file ;)
I don't know much about the Excel environment and ClojureCLR so I don't know if it's feasible at all.
The syntax is literally,
(verb arg1, arg2… argn)
I actually find that learning new languages is among the laziest, and least important things to learn in software and CS.
Please don't put down other developers over what they choose to learn.