It sounds like a proofreader or editor needs to step up regarding the charges of plagiarism for that Harvard professor - apparently some of the criticism of remarks posted "without quotes" was when

they were delivered in blockquotes, which in scholarly publications means it is a quote and you never use quotes on it (this being a blockquote that actually isn't quoting anything, just here for mechanical reasons)

but the block might not show up with the way they're searching, or they don't know what they're looking at.