In other articles (not necessarily about CRISPR) there are scientists who strive for “near human” test subjects by doping human DNA into other “things”.
If they can create a “subhuman” class they believe they are ethically clear to experiment on “it” or harvest “parts” from “it”.
The technique described in the article you linked is actually the use of pig embryos as petri dishes to direct the formation of human organs from cells. No human DNA was inserted into pig cells. The human cells injected into the pig embryos receive the growth signals from the surrounding pig cells, and that is what directs them to form organs.
My main concern is about the source of the human cells. Were they harvested from murdered babies? Or do they come from another source of stem cells, for example placenta tissue? Also, I would have concerns about retroviruses. Our genomes have a high content of retroviruses, which are mostly inert. So do the genomes of most multicellular organisms. While pig and human genomes probably share a large number of retroviruses, they are not all the same. What if an inert pig retrovirus enters human cells and becomes “ert”? What if the pig retrovirus then infects the human recipient of the organs grown in pigs? The potential of pig viruses infecting humans has been a long-standing concern of researchers who have been looking into the potential of using pig organs for transplant.
Of course pigs die for all of this research, but I don’t think there is much concern for them.