Hi,
We apologize for the delay. Also, we apologize for any misunderstanding we may have.
Looking into the available information on regards of the LIN Loopback DEMO for LLCE, we see the following information:

Also, the following is told under the example:

For which, the LIN functionality should be implemented for both functionalities.
Again, we apologize for any misunderstanding from our side.
Please, let us know.