Open graph essentially provides thumbnails and title data for a news article or publication as links, so the news article returned a header image that displays in the tweet "preview"
In this case the Tweet would have been
> TWEET
> linked article with open graph image
When exported the author then returned that same open graph info on their personal site, thus rendering a copyrighted image without a license.
In this case the Tweet would have been
> TWEET > linked article with open graph image
When exported the author then returned that same open graph info on their personal site, thus rendering a copyrighted image without a license.