That it's different for everyone, and there's a chance it was spiked with AAS?
Quote directly from the article
"As mentioned before some studies have confirmed the suppression of prolactin will lead to you tricking your HPTA (hypothalamic pituitary testicular axis) into believing that it is not on cycle. When prolactin was reduced in the body, the HPTA was able to remain unaffected by testosterone treatments. The results can reflect that the mid-range levels of prolactin reduce the sensitivity of the HPTA system. It was also highlighted in studies that having higher prolactin levels while on cycle will result in an increased HPTA (hypothalamic pituitary testicular axis) responsiveness, meaning a fast shutdown of the HPTA. With high levels of prolactin in the system it will lead to sensitize the HPTA negatively in regards to gonadal steroids."
I posted the link before, but it got removed. If you wanna check it out google "prolactin suppression on cycle". It's the first result. In no way am I vouching for it, just thought it was interesting.
I don't recall saying this? Reading over the article, it appears that the studies were done on testosterone only. So I'm guessing it might not work for test derivatives. Who knows if it even works. Studies seem well sourced though.