are these forks safe for lowriders?

I got this fork used from someone who claimed it was carbon, but I’m thinking it’s not(?). A magnet doesn’t stick to it, but it sounds lots like when I hit the key on a steel fork.

I’d like to add a lowrider front rack like Blackburn Lowrider , Zefal Touring Raider, or Axiom Journey DLX if it’s not carbon.