You have written a very powerful and moving piece.

However, since I'm a geneticist I was intrigued by the epigenetics claim, and looked up the reference you gave. But it doesn't claim what you do:

"Although recent discoveries in the biological sciences show that the effects of Holocaust trauma at a molecular level can be passed to the next generation (Yehuda et al., 2016), PTSS entails more complex mechanisms and is generally thought to be transmitted via social processes within the family, community, and society (Crawford et al., 2003)."

(Emphasis mine.) PTSS = Post-Traumatic Slave Syndrome, by the way.

I looked up Yehuda et al. also, and found a newer paper of theirs (https://ajp.psychiatryonline.org/doi/10.1176/appi.ajp.2019.19060618) that indicates that epigenetic effect of this particular locus (FKBP5) seems predominently (maybe only) to go through the maternal line, and both studies only looked for one generation, and the effect is rather modest (a few percentage points difference in frequency). Of course, this is only one gene, not a whole genome study, and the behavioral effects (which might be cultural/environmental) are large. Nonetheless, it's not very good support for the idea that there are still epigenetic changes that have persisted since the abolition of slavery. It's possible, sure. But we don't seem to have any direct evidence for it.

So, anyway, I don't think it's prudent to have a great deal of confidence in the hypothesis that there are lingering epigenetic changes from slavery (as opposed to, say, various deeply taxing situations faced by someone's parents). This doesn't detract from the rest of what you said, nor does it mean that there aren't lingering effects, but that part (the epigenetics) seems rather overstated. At this point we really don't know, as far as I can tell.