More typical Catholic balderdash. The Bible is full of idioms that any Jew would understand, and that includes Genesis 15:15. Even Catholic expositors admit that in order to understand the Bible we must first understand Jewish idioms.

An early common theme is that death means rejoining one's ancestors. Abraham, Isaac, Jacob, Moses, and other patriarchs are "gathered to their people" after death (see Gen. 25:8, 25:17, 35:29, 49:33; Deut. 42:50; 2 Ki. 22:20). In contrast, the wicked are "cut off (kareit) from their people" (Gen. 17:14; Ex. 31:14). Other imagery emphasizes the finality of death: the dead are like dust returning to dust (Genesis; Ecc. 3:19-20) or water poured out on the ground (2 Samuel 14:14).The Afterlife in the Torah

For the most part, the Torah describes the afterlife in vague terms, many of which may simply be figurative ways of speaking about death as it is observed by the living.

An early common theme is that death means rejoining one's ancestors. Abraham, Isaac, Jacob, Moses, and other patriarchs are "gathered to their people" after death (see Gen. 25:8, 25:17, 35:29, 49:33; Deut. 42:50; 2 Ki. 22:20). In contrast, the wicked are "cut off (kareit) from their people" (Gen. 17:14; Ex. 31:14). Other imagery emphasizes the finality of death: the dead are like dust returning to dust (Genesis; Ecc. 3:19-20) or water poured out on the ground (2 Samuel 14:14).

Another recurring biblical image of the afterlife is as a shadowy place called Sheol. It is a place of darkness (Psalm 88:13, Job 10:21, 22) and silence (Psalm 115:17), located in low places (Numbers 16:30, Ezekiel 31:14, Psalm 88:7, Lamentations 3:55; Jonah 2:7, Job 26:5). In 1 Samuel 2:6, God puts people in She'ol. In Isaiah 14:9-10, the departed in Sheol rise up to greet leaders who have now been brought low as they are. The author of Psalm 88 laments his impending death with these words:

I am sated with misfortune; I am at the brink of Sheol.
I am numbered with those who go down to the Pit;
I am a helpless man
abandoned among the dead,
like bodies lying in the grave
of whom You are mindful no more,
and who are cut off from Your care.
You have put me at the bottom of the Pit,
in the darkest places, in the depths.
(Psalm 88:4-7)

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