Well, I have to say, that's a new one on me. I love to collect strange hardware fixes, but I never heard of that. I have heard that SOMETIMES you can restore phone or laptop batteries that have gone bad (memory problems) by putting them in a plasticbag and sticking them in the freezer for a couple of days. But that may not be the problem.
I don't know what he's trying to do, but I wouldn't put any electronic appliance in the frige and here's why. Over time, some hours, the laptop will cool to frige temp, about 45 degrees. When it's removed, it will warm to room temp, right? Well, what happens when you take a soda or beer bottle out of the frige? It sits on the table and gets condensation. Water collects on the outside. The same thing will happen to the laptop. As the components and metal warm to room temp, water will condense INSIDE the laptop. Probably not a lot, but it can't be a good thing for the laptop. Would your boss spray it off with a hose? Yeah. I don't think it's a goodidea.
Hope that helps.