Forum:Synchro Summoning help

I was reading the tips on Scrap Dragon and it said that when it dies you can special summon scrap golem, and use him to special summon a scrap goblin, and then re-synchro summon dragon. Does this mean that you can synchro summon a monster from the graveyard, instead of the extra deck? Or did they just mean that if you have another scrap dragon?