In typical Ars fashion, the editorial team appears to be looking into what happened and are being fairly open about at things: https://arstechnica.com/civis/threads/journalistic-standards.1511650/
I will be very disappointed if this was BenJ or Dan [edit: I had messed this up, it wasn’t Dan but Kyle Orland that coauthored it] Kyle using AI to write their article since both have had really good pieces in the past, but it doesn’t sound like this is some Ars wide shift at this point. Like all things, it makes sense that it will take time for them to investigate this, Aurich (the Ars community lead and graphic designer) was clear that with this happening on a Friday afternoon and a US holiday on Monday, it’s likely to be into next week before they have anything they can share.
I would hazard to guess they are investigating how the use of AI was missed in their editorial process, how they missed the incorrect quotes, and who violated their journalistic standards by using an AI to directly write article text since it’s a coauthored piece.