The QTLinguist Documentation included in https://doc.qt.io/qt-6/reference-overview.html does not explain how to embed translations in the executable file.

But the other source I linked does...

Literally the first section there:

The Qt Resource System

The Qt resource system is a platform-independent mechanism for shipping resource files in an application. Use it if your application always needs a certain set of files (like icons, translation files, images), and you don't want to use system-specific means to package and locate these resources.

Most commonly, the resource files are embedded into your application executable, or in libraries and plugins that are loaded by the application executable. Alternatively, the resource files can also be stored in an external resource file.
The resource system is based on tight cooperation between Qt's rcc resource compiler, the build system, and the Qt runtime API.

This is what @Christian-Ehrlicher told you... and what I was referring to here:

@Pl45m4 said in [Translations] documentation on embedding translations in the executable.:

Read about the Qt Resource System, if you don't understand.

@Simplicius-Simplicissimus said in [Translations] documentation on embedding translations in the executable.:

I do not need to ship the translation files with the program.

Using the resource system you "ship" them as bytecode embedded in your binary.
You don't want to provide 17 files for 17 different languages, right?
What else do you need?!

CONFIG += lrelease embed_translations

I do not need to ship the translation files with the program.

But never mind. Ignore this thread. Ω

Embedding
Into
The
Executable.

???

That's what @Christian-Ehrlicher wrote above.
No need to mock him...
We all can read what you posted

Read about the Qt Resource System, if you don't understand.

@Simplicius-Simplicissimus said in [Translations] documentation on embedding translations in the executable.:

Is there something more recent or a documentation which is considered up-to-date with the current Qt releases?

So hard to find the current/latest Qt 6.9 documentation?!