I'm not sure exactly when that article was published (and it's not available online) but IIRC it was back in mid-late January?
Michael O'Toole is the Assistant Editor and Crime Correspondent at The Irish Daily Star, so it's his job to know about this stuff, and he does.
O'Toole has written/published 7 articles in the last 8 months, and 5 of them were about McGregor (2 about the rape, 2 about another court case (Conor's driving violations), and 1 yesterday about the guy whom Conor punched - which I'll link to below)
On Dec 11, 2018 (the day after the rape) O'Toole piblished this article:
https://www.buzz.ie/news/gardai-investigating-alleged-rape-well-known-irish-star-309971
His article from Jan 18, 2019 mentioning that the victim had given a formal statement and that the Garda could proceed:
https://www.buzz.ie/news/irish-celeb-rape-case-arrest-release-313724
O'Toole's article from yesterday with statement from the punching victim:
https://www.buzz.ie/news/man-struck-mcgregor-speaks-335606