What does Deuteronomy 2:11 mean?

So we passed by from our brothers the children of Esau, who dwell in Seir, from the way of the Arabah from Elath and from Ezion Geber. We turned and passed by the way of the wilderness of Moab.

Yahweh said to me, “Don’t bother Moab, neither contend with them in battle; for I will not give you any of his land for a possession; because I have given Ar to the children of Lot for a possession.”

(The Emim lived therein before, a people great, and many, and tall, as the Anakim.

The Horites also lived in Seir before, but the children of Esau succeeded them. They destroyed them from before them, and lived in their place; as Israel did to the land of his possession, which Yahweh gave to them.)

“Now rise up, and cross over the brook Zered.” We went over the brook Zered.

The days in which we came from Kadesh Barnea, until we had come over the brook Zered, were thirty-eight years; until all the generation of the men of war were consumed from the middle of the camp, as Yahweh swore to them.