Halfling keen eyes and flame oracle

The halfling keen eyes racial trait says "When you target an opponent that is concealed from you or hidden from you, reduce the DC of the flat check to 3 for a concealed target or 9 for a hidden one."

I presume this would count as mitigating the curse?

Yep. It’s making the effects less severe. That’s mitigation.

Sucks that a class takes away a racial trait. Does that happen for any other class?

I guess halflings stick to being battle or life oracles.

Sucks that a class takes away a racial trait. Does that happen for any other class?

I guess halflings stick to being battle or life oracles.

They can still benefit from both; they just don’t improve the flat check of their curse. They still apply it in the situations other classes would apply it.