I can see where you are coming from. I think maybe he took those verses from Douay Rheims- drbo.org.htm
I think it a play on words and can be very confusing and can easily be misinterpreted. Not sure but did he misspell the word heel to heal? Maybe a typo error.
Also, please note there are two stories of creation. The first creation story is actually the second one that was written and the second creation is the first one that was written. The second creation story is the human one, Chapter 2, here free will was used to choose evil.
Interesting enough is what St. Jerome- The New Jerome Biblical Commentary has to say;
.......The snake is not Satan, though later traditions so interpreted it (e.g. Wis 2:24 ). He is simply a mischievous creature made by God, dramatically necessary to awaken in the woman a desire to eat of the forbidden fruit; he recedes into the background when his narrative function is accomplished. The snake's question in v 1b and the woman's answer in vv-2-3 are both inaccurate interpertations of the originally simple divine command in 2: 16-17.
.......like divine beings knowing good and bad: Elohim, the ordinary name for God in the OT, means "divine beings" when it is used with a pl.vb., as here. At the snake's deceptive assurance, the woman eats and persuades her husband to eat. Their innocence lost through disobedience, they make primitive loincloth.
.......God appears at the afternoon breeze, their sin is not hid from God, to whom they are accountable. The man blames the woman. ( in ironic contrast to 2:23 ) and the woman blames the snake; just punishment will be meted out according to the order of sinning.
.......The snake is cursed, condemned to crawl on its belly , eat dirt, and be forever the enemy of the woman whom he deceived and of her offspring, he shall strike your head; "He" refers to offspring, which is masc. in Hebrew. Christian tradition has sometimes referred it to Christ, but hte literal reference is to the human descendants of Eve, who will regard snakes as enemies.
If the video quoted the bible verse from the Douay Bible, then it would have stated(from the DR bible link that you provided):
Genesis 3: I will put enmities between thee and the woman, and thy seed and her seed: she shall crush thy head, and thou shalt lie in wait for her heel.
I think the video presented something different for Genesis 3:15.