She isnt talking about the (Liberal) Blacks who voted.
She’s talking about the (Conservative) Black who didn’t vote because McDaniels didn’t bother to reach out to them.
And note, outreach doesn’t mean vote buying. She’s specifically speaking about (even specifically says) Blacks who want freedom from government handouts.
In a three-week campaign dash, you go for the most bang for the buck - in McDaniel’s case, it would be known GOP voters who did not show up in the primary. You don’t waste time going after an unknown factor.