When such things have happened in the past, they've led to an investigation and the appointment of a Public Editor or an Ombud. (e.g. Jayson Blair.)
I'm willing to weigh a post mortem from Ars Technica about what happened, and to see what they offer as a durable long term solution.
There is a post on their forum from what appears to Ars Technica staff saying that they're going to perform an investigation.[0]
[0] https://arstechnica.com/civis/threads/journalistic-standards...
Rolling Stone, for example: https://en.wikipedia.org/wiki/A_Rape_on_Campus#Columbia_Univ...