For the VRA to apply there must be racially polarized voting. A statistically significant difference must exist between a minority population and the white majority. Without that difference the choice of the voters is presumably race neutral. If there is a difference then one should be able to identify in an election the candidate of choice of the minority voters.
If some minority were to vote pretty consistently 50.5% for the Democrat, and, Whites were pretty consistently voting 50.5% for the Republican, that might not be considered "statistically significant," but, its the difference between consistently winning, and, consistenly losing.