> If they weren't, Delta would say so, since it makes them look better. That they won't say means the parts were used in service.
I tend to take that sort of cynical view too, though there is a more generous explanation that could be¹ possible: they haven't absolutely finished checking yet, and don't want to say something that they later need to correct. That could look worse than being vague to start with.
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[1] caveat: I know little of their parts tracking systems, I don't know how likely it is that a more definitive answer cannot be given that quickly.
I tend to take that sort of cynical view too, though there is a more generous explanation that could be¹ possible: they haven't absolutely finished checking yet, and don't want to say something that they later need to correct. That could look worse than being vague to start with.
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[1] caveat: I know little of their parts tracking systems, I don't know how likely it is that a more definitive answer cannot be given that quickly.