The article is currently not responding so I can't see if this is covered, but a bigger problem is the volunteer answerers. Some left when the site was sold, many remained with a wait-and-see stance and are going due to licensing changes (https://meta.stackexchange.com/questions/401324/announcing-a...).

Obviously people asking LLMs instead is an important factor, as are unverified (often not entirely correct) answers from those using LLMs to gain Internet points.