Here's two selected quotes from the article, although I can't find anything from his wiki or anywhere else other than Trump that says he was a marxist, in fact he seems to be far more neoliberal than anything else:

That predilection would shape his professional outlook as “a pro-business economist, focused on what entrepreneurs see and how they think,” said Keith Collister, a Jamaica-based business journalist and economist who has worked with Dr. Harris over the years.

“The national industrial policy was anathema to Marxists,” said P.J. Patterson, Jamaica’s prime minister at the time. “What Don was propounding was the notion of a market-based economy where the private sector, not the government, was the engine of growth. There was nothing in there about state control of industry.”

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[–] blobjim@hexbear.net 13 points 2 weeks ago* (last edited 2 weeks ago)

Yeah about the only thing I know about him is he advised the Jamaican government on economics. And it isn't like the Jamaican government has been even social democratic. As far as I know, Jamaica is totally subjugated to the US. So being an economic adviser would be more of a comprador role.

also

He enjoys tooling around in his silver Corvette, unconstrained by any campaign activity. He has been married for roughly three decades to Carol Kirlew, a fellow Jamaican-American and former communications specialist with the World Bank