No. On the other hand, I’ve never seen anything affirming that of radishes, turnip greens, cauliflower, or macadamia nuts.
I did do a quick search on Pubmed and Google Scholar and came up with nothing.
Chia was once a staple food for the Mayans, so it is unlikely that it is unhealthful even in large quantity.
On the fear of lignans and phytoestrogens: Many lignans are helpful. Some phytoestrogens are helpful and are not estrogenic. (It is not required to be estrogenic for a compound to be in that category.)
I wasn’t addressing that matter at all, actually, just the specific statement that I did address.
On whether flax is problematic in this regard, Dan Duchaine used to recommend flax seed oil for the gyno-sensitive precisely because of the lignans, and some liked his recommendation. I never heard of anyone trying it and saying he had it backwards.
(I’m not referring to gyno protection while using anabolic steroids, but for those who are bothered by it under normal conditions, and where a marginal difference might be noticeable.)