Only if you’re speculating about the income and demographics of the students.
The OP says community college student transfers do well when they are admitted to elites, period.
I infer that CC students either didn’t apply to elites as HS seniors, or didn’t have the grades/test scores to get in, or couldn’t afford anything other than CC, or their parents were poor planners without good financial safeties, or their parents simply thought they’d do better at a local CC for some reason, perhaps to live at home or deal with an illness. Any/all of those.
I agree, that’s remarkable.