So what if they did? There wouldn't really be anything wrong about doing that. Germany have been mocked many times by Top Gear over WW2 and by plenty of other famous people, the Germans didn't come out in their hundreds and throw stones at them though... The controversial thing here is the way the Argentinians reacted. Over a number plate.
I don't care what the argies done. it annoys me that top gear are denying it and saying it was a coincidence.