My dad's side of the family is indo-guyanese (and he was specifically in tech for his whole career). It's interesting, they've (and I, to a lesser extent) reported something similar, where every once in a great while people from India will recognize our last name and then slowly realize we don't have much in common culturally. Our food is "caribbean-indian" for instance (apparently Trinidad has something similar), it's kind of different than what you'd get from in a regular Indian restaurant.

The comment the author made about the caste system not coming to Guyana tracks too, my aunt has encountered people making quips about it at work every once in a blue moon.