Your use of reputable and objective scientific sources really strengthens your fact-check. Additionally, your examination of the specific benefits of dark chocolate, along with its less healthy aspects which suggest moderation, provides a nuanced view of the article’s claim. I think that you could go further by examining the original source, published by Popcorn for the People and written by Jason Katz. When looking up Jason Katz, I couldn’t find his other writings, and the website of the article appeared to be a popcorn company. Given the product advertisement at the end of the article, it seems that there was profit motivations behind the article, which would have been important to analyze and really would have added to your thorough fact-check!