Aren't they? How can you tell? They look just like the ones I had fitted to my old GTi and the ones fitted to my current GTI - both are factory fit Xenons... what am I missing? 
Actually - they arn't genuine VW xenons either! 
I might actually be mistaken about you image from earlier in the thread, because you can't actually see a close up of the headlamp for any definative detail.

However, the geniune OEM Golf5 xenons have a larger diameter 'fish eye' glass lens, when compared to other non-genuine Mk5 lights, even those projector style halogens.

I'm busy searching for a decent close-up . . . .