This is an interesting article, but I think she has gotten the wrong end of the stick here
"Terfblocker (terfs being trans-exclusionary radical feminists) allows Twitter users to automatically block all of those users deemed ‘transphobic’ (ironically, feminists on the receiving end of the tool adopt similar tactics when it suits them, as in the Irish abortion referendum)."
This is a misreading of the situation. Feminists using Repeal Shield (anti-abortionist blocker) were more likely to be coming from the "Trans women are women" school of thought than not, though many pro-choice people would have no position on trans issue and have no idea what is going on.
Only a tiny number of people in Ireland are raising concerns about self-id and other trans issues. So only a very small number of Irish people would be on Terfblocker lists.
Some prominent people and groups involved in the pro-choice campaign see any questioning of transactivism/transideology as transphobic, and oppose meetings for women to discuss the potential impact of self-identification laws on women., e.g.feministire.com/2018/01/22/an-open-letter-to-the-organisers-of-the-we-need-to-talk-tour-from-a-group-of-feminists-in-ireland/ (note the first signatory in particular.) There was also a #terfsout hastag on twitter about the same time as that letter was published (as far as I can remember that was the timing of it).
I know of at least one woman who was a pro-choice campaigner on the abortion issue, who was put on the anti-abortionist blocker, I think due to her position on transactivism.
There were some sound reasons for some people to use the Repeal Shield (anti-abortionist) blocker, due to dummy accounts and people from the US trying to influence the referendum in Ireland. So I don't think using Repeal Shield is quite the same as using terf-blocker. There is a good article here on the issue www.thetimes.co.uk/article/american-anti-abortionists-posed-as-irish-on-twitter-for-referendum-9cs88bbkc
I didn't use it myself, and don't like the idea of mass-blocking people, though I can see that sometimes it might be justified (one of my concerns about mass blocking lists is how people can get unfairly put on the lists. I think once someone is not a troll they shouldn't be put on them)