So he might truly and sincerely say, though after this speech he was overcome by the entreaties and persuasions of Moses. Or he did go and settle his affairs, and afterwards return; for we find his posterity settled among the Israelites. See Judges 1:16, Judges 4:11,18, &c.
Related Commentaries of Numbers 10:30
Numbers 10:30
30 And he said unto him, I will not go; but I will depart to mine own land, and to my kindred.