If you google charles nguyen or the email address you get an archive listing of all his for sale posts on TT. The list of for sale posts at TT and the list of rackets on that flyer are ridiculously similar, in fact almost identical. Would suggest either those are one and the same guy or at least know each other/work together.
I tweet - @ashtennis guru (no spaces)
I Shoot - www.flickr.com/photos/ashtennis guru/ (again no spaces! grrr)