If I remember correctly, that deck is a weird combination of combo and aggro and you can't have aggro without flamebloods. Anti-synergy with artifacts is obviously there but you're supposed to use flamebloods either before you equip your wombo combo or at the end to close out the game. And repulsors are there because they are simply the cheapest form of quasi-removal and you do need some to gain time in order to gather the combo pieces. The deck is inconsistent but is crazy fun.
About how would the "optimized" version look in today's meta, I have no fucking clue.