This is the poster who posted a 2016 study this in defence of them saying
You see most of our research showed that the women of the general public do not fear mixed sex toilets and don't mind transwomen using them. So that's why we concluded that the whole toilet thing really wasn't going to change any minds.
https://link.springer.com/article/10.1007/s12147-016-9181-6
Which uses this methodology
"The author searched the Australian version of Google News (sourced between April 29 and May 16, 2015) for news and blog articles for phrases such as transgender bathroom and manually inspected a large number of web news articles and opinion pieces for comments made in relation to safety and/or privacy in female bathrooms."
"Of the articles inspected, 190 contained suitable comments, from which the author collected 1035 comments. All articles were dated between 1 December 2014 and 10 May 2015 (inclusive)."
and
"In this section, we describe how we collect comments from online news articles pertaining to the safety and privacy of patrons in female bathrooms, dividing them according to
(a) the gender of the user who made the comment,
(b) whether or not the comment is a negative comment,
and (c) in the case of a negative comment, whether the comment describes a causal or incidental link between transgender females and safety and privacy in female bathrooms (or neither)."
And this paper has drawn this conclusion which is remarkable.
"Therefore, we surmise that they did not consider transgender females in female bathrooms a serious concern for their constituents (unlike 50% of the men opponents)."
Who the fuck analyses public comments to news articles with the view to establish how many women and girls have been harmed by male inclusion based on whether the victims of harm mention it in their public comments? Of course women and girls are not going to be making public their instances of harm in public comments.
It is a rarity to do this even now. Yet, this paper drew this conclusion based on that criteria.
I would also check out the author as I suspect that this particular mathematician is very motivated to find the conclusion that they did.