icocer,
Welcome. Nice link there. Yes, it would be absolutely in line with Watchtower Society "journalism" to do exactly this - quote only those portions of a book, chapter, paragraph or even sentence that agrees with the point they're trying to make while leaving out anything that disagrees with Witness teaching. The infamous WTS elipses... They frequently have partially quoted a source in such a way as to give exactly the opposite meaning of what the person being quoted actually was saying.
I'm a professional journalist, and part of the reason I left the Witnesses was because of their unethical journalistic practices. In any legitimate publication, WTS writers would be fired and vilified for these acts.
On an interesting side note, I found it amazing that your link showed that most of the writers the WTS quoted to prove that the trinity is of pagan origin were actually saying that ALL of Christianity is essentially from pagan religions - something that I'm coming to more and more understand and believe. Whoever is running that website defends the trinity by dismissing these scholars because they question any kind of supernatural origin for Christianity or Christian teachings - not because of a lack of scholarship. His/her reasoning is absurd - a prime example of "truthiness" at work (I have a gut feeling that Christianity comes from God, so, despite all evidence to the contrary, it must be so).
S4