Generally speaking, when you research this kind of invasive technology you pay attention to the effects of the procedure. If you get evidence of malpractice or procedures that have plenty of severe side effects, you put a hold on the whole thing and go back to the whiteboard. There are plenty of things here signaling wrong procedures, line really wrong. 15 out of 23 mammals having died is not noise, it's signal.

"One primate developed a bloody skin infection and had to be euthanized. Another was discovered missing fingers and toes, “possibly from self-mutilation or some other unspecified trauma,” and had to be put down. A third began uncontrollably vomiting shortly after surgery, and days later “appeared to collapse from exhaustion/fatigue.” An autopsy revealed the animal suffered from a brain hemorrhage."