It does look kind of suspicious, Two 3DS are used, it doesn't look like he/she's pushing the DSTwo in the 3DS. It looks like a fake, that and the white 3DS is on 6.1.0, i thought Gateway needed a 4.5.0 3DS to work ?
Edit- Tried on my 3DS, unfortunately i don't think it will ever work due to my 3DS being on 6.1.0, it looks like it wants to work but, all i get is a error message telling me the software crashed and the console has to restart. Bummer, really wanted to see if it was possible to use Gateway mode with a Supercard