That's not how it works.
"Genocide" is the attempted killing of a people.
So, if there were a genocide against the Afrikaans then there would be evidence that this were so. Like statistics that show a targeted campaign of violence against that particular group.
There isn't.
South Africa's murder rate is about 45 per 100,000. The US is at about 6 per 100,000
Now, farmers generally live in safer places.
An overview map of the murder rate (per 100,000 population) per police station between April 2022 and March 2023, including an indication of quarterly murder incident trends.
crimehub.org
For example Kimberley right on the eastern edge of Northern Cape is much safer than Jo-burg, Pretoria, Cape Town, Durban etc. It's a diamond mining place. Still unsafe compared to the countryside. It's somewhere between 15-32 murders per 100,00 people, whereas Jo-burg has places at 200-300 per 100,000 people.
There are no race crime statistics in South Africa.
White farmers have been murdered in South Africa, but those murders account for such a small percentage of the country's total and do not amount to genocide, experts say.
www.pbs.org
"White farmers have been murdered in South Africa. But those murders account for less than 1% of more than 27,000 annual murders nationwide."
Less than 1% is probably much less than 1%.
"The South African Police Service’s crime report for the period from April 1, 2022, to March 31, 2023, shows there were 51 murders on farms of a total of 27,494 murders nationwide. But the data has limitations."
So, 51 murders on farms *maybe, and not all of those murders would have been white people, because black people work on farms too. And many Afrikaans aren't farmers. Maybe 44,000 from 2.7 million people.
Afrikaaners live mostly in the west of the country where murder rates are generally lower.
The statistics suggest Trump is wrong. Violence exists in South Africa, it affects everyone, but it affects poor black South Africans far more than anyone else.