Good details, but I thought I should note that this is pretty much what Apple's Human Interface Guidelines indicate that you should never do.

https://developer.apple.com/design/human-interface-guidelines/ios/visual-design/launch-screen

To quote: Don’t advertise. The launch screen isn’t a branding opportunity. Don’t design an entry experience that looks like a splash screen or an "About" window. Don’t include logos or other branding elements unless they’re a fixed part of your app’s first screen.

Does Messages launch with a Messages icon? Weather? Settings? Mail?

By and large, your launch screen should mimic your primary application main window so that it looks as if your app actually launches faster.

It's also one of the main use cases for the new "redacted" view modifier where you display placeholders for your data prior to actually obtaining it.