The point was that the Gospel was preached to Abraham which you denied.
You called it a Covenant, fine, Paul called it the Gospel. Likewise the Land Covenant was also Good News (Gospel) for Abraham. But go ahead do your mental gymnastics and worm out of it.
The LORD said to Abram, after Lot had separated from him, "Lift up your eyes and look from the place where you are, northward and southward and eastward and westward, for all the land that you see I will give to you and to your offspring forever. I will make your offspring as the dust of the earth, so that if one can count the dust of the earth, your offspring also can be counted. Arise, walk through the length and the breadth of the land, for I will give it to you." So Abram moved his tent and came and settled by the oaks of Mamre, which are at Hebron, and there he built an altar to the LORD.
(Gen 13:14-18)