If there were ever such a thing as reparations, in the form of giving X amount of money to people as individuals, it would probably be based on the litmus-test question of "are you perceived by society as black, are you treated accordingly, and have you suffered the loss and degradation that society metes out for black people?". Many black people are far more white than they are anything else, however, they are still tagged as "black". I know this is common knowledge, but some black people have been able to "pass", and have done precisely that. You would have absolutely no clue, for instance, that Eartha Kitt's daughter and granddaughter, the pop singer Halsey, or probably even Rashida Jones (daughter of Quincy Jones and Peggy Lipton), have black ancestry.
So, no, an outwardly white person with a few drops of African blood, unknown to anyone else and possibly even to himself, wouldn't be entitled to "reparations" by any stretch of the imagination.
Please do not mistake my comments for support of reparations. I'm sure that in the eyes of some, "reparations" would not be complete unless we were to leave the house and car keys on the kitchen counter, leave our homes with only a suitcase, and get on the airport shuttle to take a one-way flight to whatever historically white country would take us in --- Russia, anyone? (They made a very generous offer to white South African farmers whose lands were confiscated.)