Did The Flash just introduce Black Flash?

Did The Flash just introduce Black Flash?

I fully don't get Black Flash. Does he come for you when speedsters start to die? Why does he just chase random people? - Quora

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The Flash' Anatomy of a Scene - The New York Times

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What is DC's Black Flash's back story? - Quora

The Best Flash Comics to Read Before (or After) DC's 'The Flash