Well, no. You dropped a few decimal points somewhere. Three, I think.
296,654,054,400 sq. feet / 10,000,000 = 29,654 sq. ft. not 29.6 sq. ft.
Which is about 0.68 acre. Enough in theory to grow food to support a person.
Of course much of Haiti is extremely mountainous, and much of the rest has been eroded and its productive capacity largely destroyed.
The article makes IMO unjustified claims that Haiti through most of the 19th century was a tropical self-supporting Eden, until the evil USA came in and forced the people into cities.
At best Haiti during this period was a subsistence farming economy. While such is often idealized, you will note that damn few of the idealizers ever volunteer to actually live this life.
Haiti was known as the “Pearl of the Antilles” when it was a colony. After independence it became what it is now, and it won’t change absent a complete worldview transformation. I wouldn’t hold my breath on that.
Haiti is just a big welfare camp. We can see what that sort of society produces.