I'm guessing that means they aren't super-confident in where they're getting, or if they're getting, better information.
The CDC has a lot of good people working there, like all the federal agencies (like CIA, FBI, NSA, DOD). But the prior POTUS liked to disparage them all publicly eventually leading to it becoming a popular thing to do for some. As if any organization charged with handling such immensely complex problems is never gonna make mistakes, especially, in CDC's case, in the face of a rapidly evolving new pandemic. Add in all the disinformation campaigns from Russia and others, aimed at sowing dissention and distrust of the government, and it's not wonder it's so popular to bash those agencies.
But maybe I'm wrong. Maybe people have identified better, more reputable, more qualified sources of information about everything the CDC does. If so, I sure hope people will share those great sources.
I'm guessing the only responses will be yet more populist criticism of CDC with no evidence of anything better.