Are Asians counted as "Other/Unknown" here? Because Forsyth County has a sizable Asian population, attracted in part due to the perceived quality of the area's public schools.
https://en.wikipedia.org/wiki/Gwinnett_County,_Georgia#DemographicsPer Wikipedia, Gwinnett County was ~32.5% NHW, 27% Black, 13% Asian, 23% Latino, and 4.5% everything else in the 2020 census. The split in that chart is 40% White + 50% Nonwhite + 10% Other.
To answer the OP: I don't think TX will ever become a reliably D state, but I can definitely see it voting for a Dem presidential nominee in 2028.