It could be he was speaking in the broadest sense. The Allies did sneak troops behind German lines, just not in platoons, but three entire divisions.
If he did mean sneaking a recon platoon behind German lines, think abut the mechanics. The 101st glider troops landed largely in the afternoon of June 6th. The divisions fought in Normandy until relieved in late June. If you wanted to sneak a recon platoon behind German lines, you would have to take them out of the line, send them back to England to load them into glider (both airborne ops for Overlord and Market-Garden launched from England), then fly them back to France. Possible, I suppose, but a lot of effort. Then, once infil'ed, how do they get back? Until the end of July, the Germans had a continuous front from east of Caen on the Channel all the way across Normandy to the west coast of Normandy. Getting a platoon behind German lines might be difficult, but getting them back would be near impossible. It would probably be a one way trip.
As someone else said, that is how they got the heavy lift cargo out (i.e. jeeps, 75mm pack howitzers, etc.).