This article is claiming that Dark Chocolate has multiple health benefits, such as protection against free radicals, cardiovascular diseases, improved cognitive function, and the potential to prevent cancer. When they dive into each of these claims individually, there is some evidence that is factual. The problem is the overhype of small health benefits.
This article was written by a company that sells popcorn, with some recipes including dark chocolate. While this could raise red flags for a hidden agenda, they quote a Harvard study from hsph.Harvard.edu which is a credible source.
Dark chocolate: An overview of its biological activity, processing, and fortification approaches - PMC
“Intestinal inflammation is also delayed by cocoa polyphenol by reducing neutrophil infiltration and the expression of the different transcription factors, thus, the production of pro-inflammatory cytokines is getting lowered. Cocoa polyphenol also possesses chemoprotective effects, antimutagenic effects, anticarcinogenic and antiproliferative effects, etc.” This directly backs up the claim “Dark chocolate is loaded with radical fighting antioxidants. Antioxidants such as vitamins and phytochemicals…”
Is Chocolate Good for You? | American Cancer Society
It makes a big claim that chocolate may prevent cancer. The American Cancer Society states, “Regardless, the studies have come back with mixed results. Some report that eating chocolate may lower the risk of certain cancers, while others show no benefit. Still others show that eating chocolate increases cancer risk. There is stronger evidence suggesting that eating chocolate may help prevent heart disease. Flavanols have been shown to lower blood pressure and make your heart, veins, and arteries work better”. The “may” in the statement, “May Prevent Cancer”, it's a very strong may. This is a slightly misleading claim as, stated above, results or research varies and contradicts other studies.
Overall the broad idea is true and backed by credible sources, but its benefits are overhyped and have very little impact on one's health. The fact that they end the article with a link to buy their popcorn almost discredits them.