Answer

You can suggest all kinds of nice interpretations, but I don’t think there’s any way to determine exactly what they meant. This is the context in which it appears:
[15] Another interpretation: “And He called to Moses, and the Lord spoke…” From here they said: Any Torah scholar who has no sense—even a carcass is better than he is. You can know that this is so: go and learn from Moses, the father of wisdom, the father of the prophets, who brought Israel out of Egypt, and through whom many miracles were performed in Egypt—wonders in the land of Ham, awesome deeds at the Red Sea—and who ascended to the heights of heaven and brought down the Torah from heaven, and was occupied with the work of the Tabernacle, yet he did not enter the innermost place until He called him, as it is said: “And He called to Moses, and the Lord spoke.” Elsewhere it says: “And the Lord saw that he had turned aside to see, and God called to him from within the bush and said” (Exodus 3:4). At the bush, there was a pause between the calling and the speaking; in the Tent of Meeting there is no such pause as there was at the bush. What is this comparable to? To a flesh-and-blood king who became angry with his servant and ordered him confined in prison; when he gives orders to the messenger, he gives them only from outside. But in the Tent of Meeting, when he is happy with his children and the members of his household, and they are happy with him, when he gives orders to the messenger he gives them only from inside, like one who seats him between his knees, like a man’s hand upon his son. Therefore it says: “And He called to Moses.”
It seems to me that this is talking about manners and proper conduct. It is brought in the midrash in the context of the calling to Moses, who did not turn toward the Tent of Meeting until he was called.
Another possibility is that “da'at” here means connection, in the sense of “And the man knew Eve his wife.” When Moses entered the Tent of Meeting, he was connected to the Divine Presence, and then he had da'at. Sometimes a person can be brilliant, but his mind is not straight and not connected to reality and to understanding it.