If one removes a cell from an embryo they are no longer "intact".
The consequence of such cell removal on the the further development of the organism is the question. It might have profound consequences.
Even amniocentesis which is done in utero and removes only cells from amniotic fluid has a certain rate of inducing birth defects.
At a much earlier stage of development with many less cells, taking one might make the leftover completely non-viable.
Perhaps these questions are addressed in the article, but that would mean mouse experiments.
PGD on IVF-derived human embryos prior to transfer into the mother's uterus is a routine procedure. There are lots of normal healthy children running around who had one cell plucked at this stage. And some who had a cell plucked, and were then frozen for future use, because there were too many normal embryos to safely transfer into the mother at one time, and then thawed and transferred later.
Researchers are still destroying human life but giving it a different name. The source embryos are not implanted in a uterus, so they die. Human life is still being destroyed. Adult stem cell research where all the successful cures and treatments are coming from does not kill human life.