According to folks that do the historical research at Monticello, Jefferson owned 700 slaves over his life time.
Right.
There is little about Jefferson’s treatment of his slaves that can be considered admirable or even acceptable.
This part is just wrong. “Jefferson gave away many of the estimated 170 slaves he owned after his death.”
Jefferson free two slaves during his lifetime and five in his will. Arguably because they were his children, or at minimum were blood relatives. Another two possible offspring were allowed to escape.
That’s a total of nine freed, out of 170 or possibly 700. To my mind that’s simply not “many.”