Hearing about lucid dreaming in a dream doesn't necessarily guarantee lucidity.
If your awareness isn't high enough then you will just be like "ah, someone is talking about lucid dreaming here in this waking life".

You need to develop a more skeptical attitude so that your reaction becomes "wait a second! could this mean I am dreaming...?!".
If you often have dreams like this then you could tell yourself before going to sleep that you will realize that you are dreaming next time a dream character mentions lucid dreaming.
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