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No not at all. Machine politics was fueled by patronage. While legal then, patronage is mostly illegal now.
He's saying that absent patronage, blacks are risk averse when it comes to their vote because they want to defend civil rights gains. No "Overton Window" for them! 
He specifically mentions cementing ties with front runners as opposed to risking political capital on candidates making an outside run. That suggests a form of patronage. Not corruption but guarantees to not mess with certain status quo issues.
Securing political promises isn't patronage tho. Patronage involves economic concessions: Jobs, No show jobs, Tax breaks, preferential union contracts, preferential pension terms, funding specific contractors, etc. Asking a pol 2 support say abortion or Medicare is not patronage
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