CDC has a .gov email.
I think the point is that CDC is NOT SOLELY a government agency but is in fact a hybrid.
“The CDC Foundation is an independent nonprofit and the sole entity created by Congress to mobilize philanthropic and private-sector resources to support the Centers for Disease Control and Prevention’s critical health protection work.
We are a catalyst for unleashing the power of collaboration between CDC and philanthropies, private entities and individuals to protect the health, safety and security of America and the world.”
CDC foundation is the plug in point for massive amounts of funding not directly overseen by Congress. That money gives weight to whatever the donors have in mind. CDC.gov then does whatever they are obligated to do.