Sounds like an excuse to me.

But, 'ready for production' is a relative term that must be considered in context. Apple is encouraging developers to submit apps with Swift, so clearly they think it's 'ready for production' in some contexts.

If you're building an app for which an obscure, swift-specific bug may cause a critical security or safety issue for your customers then perhaps go with objective-c to sleep better at night. Although my impression is that Swift is stable enough even for this category of apps.

But, I'd wager that vast majority of apps out there do not fall under that category.