Note that this article is only about edits made through the Wiki Edu program, which partners with universities and academics to have students edit Wikipedia on course-related topics. It's not about Wikipedia writ large!
So it's more about how generative AI is a problem in college right now because lazy students are using it to do the work than about Wikipedia itself, I think.
LLMs definitely fit the use-case of Wiki Edu students, who are just looking to pass a grade, not to look into a topic because of their interest.
Sometimes it is really sad to read from (even PhD level) students on social media about their paper writing practices.