What happened to FDA employees who were investigating Elon Musk's brain chip technology?

According to Rachel Maddow's report, 20 employees from the FDA's Office of Neurological and Physical Medicine Devices were suddenly fired. This unit was responsible for investigating Elon Musk's company that aims to graft computer chips onto human brains. The timing raises questions about potential connections between the dismissals and the oversight work these employees were conducting on Musk's neural interface technology. Maddow frames this as potentially more than coincidental, suggesting possible interference with regulatory oversight of this controversial brain chip technology.