Hadn’t seen that particular compilation before, but am familiar with most of the material.
The problem with using the OT to show the validity of slavery is that there is very little in common between the slavery of the OT and that of America.
Slavery here was much closer to that of the classical world, but there was one HUGE difference. Slavery in the classical world never had a race connection. Racism + slavery made a peculiarly toxic mix.
The link was given in response to your inference that Jefferson was a hypocrite, not to validate slavery using the OT or otherwise.
The Founders Believed Slavery Was Fundamentally Wrong.
"Thomas Jefferson's original draft of the Declaration included a strong denunciation of slavery, declaring the king's perpetuation of the slave trade and his vetoing of colonial anti-slavery measures as one reason the colonists were declaring their independence:
He [King George III] has waged cruel war against human nature itself, violating its most sacred rights of life and liberty in the persons of a distant people who never offended him, captivating and carrying them into slavery in another hemisphere. . . . Determined to keep open a market where MEN should be bought and sold, he has prostituted his negative for suppressing every legislative attempt to prohibit or restrain this execrable commerce. 22 "
The Founders took action against slavery.