I would trust the Source 1 i.e., the “Sworn testimony by American Sergeant in Congressional hearings in 1969” more because a sworn testimony is a gold evidence for the Congressional hearings. It won’t affect a person i.e., the Sergeant in any way. Maybe the testimony can get corrupted by lying, forcing and constraining, and the shaking the human memory. But in a speech by the General can affect his reputation as he can hid the truth and lie in his speech. So, the sworn testimony is more reliable than the speech.
Many scholars define sḫm (sekhem) as the living force or life force of the soul that exists in the afterlife after all judgment has been passed. However, sḫm is also defined in the Book of the Dead as the "power" and as a place within which Horus and Osiris dwell in the underworld.
