I don't think you can draw any conclusions about Apple's attitude toward dogfooding. I'm sure Swift is being heavily dogfooded there, they were just telling you

I don't think you can draw any conclusions about Apple's attitude toward dogfooding. I'm sure Swift is being heavily dogfooded there, they were just telling you that it hadn't reached the point where it could be used in the project they had in mind for you (especially if it's back end, which seems to be the case since your project was in Java).