That's not a fact, it's inconclusive. Steroids like Deca, also a progestin, actually lowers prolactin. Prolactin raise parallell to estrogen levels, doing nonaromatizing gear exclusively probably lowers them. Prolactin causing gyno is a myth as well.
Alot of supposed assertions in the field of AAS can be labeled as inconclusive, but I'll take the reasoning of Llewellyn or Roberts over other people, including you, Bildernugga.
I believe it was William Llewellyn who said Tren did exhibit some progestin activity...
I haven't known anyone who I can safely say had Tren-induced gyno, but I have seen people lactate from it, and indeed, prolactin does cause lactation.
Is that inconclusive as well?
Not to me, since I've seen it with my own eyes.
DIV