@Pacopoolio, Welcome, by the way!
You are probably right. In which case, you are now armed with what is really published.
It appears the definitive "published" article is the g9/22 03 p. 27 "Young People Ask... Should I Get a Tattoo?" It's the only reference in the new "Research Guide" on the 2013 CD. I'll have to check out some older articles pre-WT Library timeframe at a later date. But, nothing post 1950 in the Watchtower or post-1970 in the Awake! use 2 Cor 7:1. There are three references that aren't on the library, two Awake! articles from the '60s that I haven't looked at, yet, and an Aid Book reference. I'll see if any of these references 2 Cor 7:1.
Noteworthy, and this was repeated in a letter from readers, were these comments:
Of course, Christians are not under the Mosaic Law. (Colossians 2:14) g95 10/8 p. 30 in response to a letter from someone who referenced the Law at Leviticus 19:28
The biggest reason for prohibition against tattoos seems to be what others might think.
Both these quotes are from the g9/22 "Young People Ask..." article.
You should also give serious thought to how others might feel about your wearing a tattoo, as many react negatively. (1 Corinthians 10:29-33)
Consider also whether choosing to get a tattoo would enhance or undermine your claim of being a Christian. Could it be a “cause for stumbling” others? (2 Corinthians 6:3) True, some youths have had their tattoos placed on hidden areas of the body. Even their parents may not know about these secret tattoos. But beware! An emergency trip to the doctor or simply taking a shower at school could make your secret common knowledge! Better it is to “conduct ourselves honestly in all things,” avoiding foolish deception.—Hebrews 13:18.
Best,
~LQ