If look at code where ".navigationBarTitle" is declared I see this code:
@available(iOS, introduced: 13.0, deprecated: 100000.0, message: "Use navigationTitle(_:) with navigationBarTitleDisplayMode(_:)")
@available(macOS, unavailable)
@available(tvOS, unavailable)
@available(watchOS, unavailable)
public func navigationBarTitle(_ titleKey: LocalizedStringKey, displayMode: NavigationBarItem.TitleDisplayMode) -> some View
It has different redeclarations, but here no any words about ".navigationBarTitle" is deprecated. It's presented in ios13, will be deprecated in ios100000 :).
XCode shows deprecated methods for sure, but it also depends of used minimaldeveloper ios version you use - if you use some old ios versions - you can not see messages, because of code is "not yet" deprecated for used minimal version.
Update:
here I attach the image showing XCode deprecation message.
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