Professor Marc Shapiro on seforimblog brings from Rabbi Mondshine that the Torah Temimah never saw Mayan Ganim. Here’s a quote (I’d post a link but links are forbidden):
“Yet”The truth is that Epstein never even saw the book and thus did not know the true nature of Ma’ayan Ganim. He learnt of the relevant passage, which he places in Rayna Batya’s mouth, from an article that appeared in Ha-Tzefirah in 1894. We see this from the fact that the Ha-Tzefirah quotation mistakenly omits some words, and the same words are omitted in Mekor Barukh. This shows that his knowledge of this book came in 1894 and that he never discussed it with Rayna Batya, who died many years prior to this.”