As this very thread has made clear, Palmer Luckey's reputation has been damaged by Facebook's choice to renege on their statements regarding requiring a Facebook login. That's an injury. If it had been part of the contract he would absolutely be in a position to enforce it in court. It was NOT in the contract.
The great-great-grandparent post from this one (by
jacquesm) already raised your point and doubted that it is enough. I'm not claiming an opinion on whether this claimed reputational damage qualifies as an injury.
I'm just saying that an injury is required in principle (with an appropriate citation), because the great-grandparent (by vijayr02) didn't think that was the case.
A contract is a matter for civil law. Breaking a term of a contract doesn't automatically mean that a court will consider a remedy.
See https://en.wikipedia.org/wiki/Standing_(law)#Standing_requir...: in the US, "the plaintiff must have suffered or imminently will suffer injury".