Answer: Inarticulate speech does not mean problems with speech, but the fact was that it was difficult for Moses to explain the essence of his actions because they seemed completely unreal, wrong, and not from our world to others. After all, you cannot express intention in words, and it will not be clear to other people.
Therefore, everyone who saw what Moses was doing believed that he is not of this world, was acting wrongly and giving them wrong recommendations.
Question: Can we say that it was difficult for him to explain to all the other egoistic desires why it is necessary to leave Egypt because reception is our nature?
Answer: This is correct. First one needs to explain to oneself and then also to others.
From KabTV’s “Spiritual States” 4/19/22