Another possibility is that you have borrowed generously from the email to write this piece, again without attribution.  I choose not to believe this.

A third possibility is that the piece, whoever wrote it, is the subject of an agreement to use it, in slightly varying form, in different places such as this blog, Vander Ark's email, and perhaps others.  Is that it?

I have responded to Vander Ark's email here, and the same response will suffice for your post.  It is somewhat gratifying to see that you have removed the language denigrating my blog, although it doesn't thrill me that you call me "underhanded, professionally unethical, and deceitful."  For that, you should apologize.  It is (or should be) beneath you, and you can make your point without it (and, for the record, it is untrue).