"Non-existent" encompasses both "killed" and "left the country as refugees".
Well sure, but they left to escape being murdered. Their main beef was with specifically French white people though. They spared a group of Poles and worked with many white German and USA American traders in the following years.
>Philippe Girard writes "when the genocide was over, Haiti's white population was virtually non-existent."
That seems pretty in-line with what OP stated, I'm not familiar enough to know if Philippe Girard is a reliable source but the reference seems legitimate.[1]
[1] https://www.tandfonline.com/doi/abs/10.1080/0031322050010619...