well what it sounds like is hacks to me, especially the sticky grenades.
But for the proxies, I'm not so sure. The reason is because when I was a low level I good searched faster ways to get the good gear on Goldeneye. One of the links was a topic (on gamefaqs I think) saying that there are promotion codes for online that come with the James bond goldeneye bundle. Kind of like the Socom 3 online code for PSP. Once again I'm not sure but that could be the case. But I HIGHLY DOUBT this to be the case because of the 3 proxies he laid as well as the sticky grenades.
Hope this helps!