It seems they did have to dump some fuel as they were diverting to YFB. The airfield scrambled to clear the runway, but couldn't do a complete job in time, so the landing was done on the partially cleared runway.
Another interesting angle to the prefect landing is that Swiss hired/transferred their ARJ flight crew to the 777 ops as the existing A330/340 wanted wage hikes.
The horror scenario presented by the union in the press after this decision was 'imagine a RJ pilot having to deal with an emergency over the atlantic'
