From what I could tell from the article, it did not seem odd at all

Animal 15 began to lose coordination and staff observed that she would shake uncontrollably when she saw lab workers. Her condition deteriorated for months until the staff finally euthanized her. A necropsy report indicates that she had bleeding in her brain and that the Neuralink implants left parts of her cerebral cortex “focally tattered.”

Along with claiming that no monkeys have died because of a Neuralink implant, Musk has said the startup “chose terminal mon[k]eys (close to death already)” as test subjects to “minimize risk to healthy monkeys.” However, Wired cites an anonymous former employee saying that is not true: Shown a copy of Musk’s remarks on X about Neuralink’s animal subjects being “close to death already,” a former Neuralink employee alleges to WIRED the claim is “ridiculous” if not a “straight fabrication.” “We had these monkeys for a year or so before any surgery was performed,” they say. The ex-employee, who requested anonymity for fear of retaliation, says up to a year’s worth of behavioral training was necessary for the program, a time frame that would exempt subjects already close to death’s door.

This didn't seem odd to you?