Is he aware that it's an Air-Water intercooler on the Redline??? At best, you could get the temp to drop SLIGHTLY, at worst you could freeze the water in the intercooler heat exchanger. Makes no sense to me at all.
From my reading, SMS is VERY experienced with turbo applications, typically Air-Air in those, perhaps he's not thinking clearly about the Redline's intercooler system.
With an Air-Air intercooler, you can safely freeze the entire intercooler. The extreme cold of the heat exchanger makes it act like a block of ice that the air is flowing through. You would need MUCH longer of a spray to get the liquid in the intercooler to chill... Plus, you have the air conditioning in front of the intercooler heat exchanger. So anything that you spray, is gonna have to go through that exchanger first, and then to the intercooler's. My guess, is that the A/C heat exchanger is NOT going to like that abuse for long... just a guess...