I suspect their determination to ensure a lack of bias may well result in them including articles from both a left, and right, perspective. Their coverage of the original “research” was actually more objectively described than it was elsewhere, even if they use the term “mastectomy” to describe what the scientific report from the “NLM” describes as “breast reduction procedures” and says concerns may be unwarranted. A report that you referenced in support of your claim. Most of the Reuters article is about hormone treatments, doubtless because they are by far the most common.
The basis of your original claim is an article published by “The Manhattan Institute”. An organisation at least partly funded by the Koch brothers. I found this analysis of their reputation:-
CJ&D is a tax-exempt nonprofit group that works to protect the civil justice system and fight tort reform.
centerjd.org
Enough there to justify considerable suspicion about the quality of anything they produce and the motivation for its production.