It's because the article is withholding information* to "guide" the viewer towards conspiratorial explanations. Especially with lines like this:
What China’s lab was targeting with so many dangerous pathogens remains a mystery
Meanwhile, elsewhere, this was already answered:
https://apnews.com/article/california-biolab-covid19-test-kits-china-arrest-3ee30af1548356e017276860ebb21f53
The Chinese owner of an unauthorized central California lab that fueled conspiracy theories about China and biological weapons has been arrested on charges of not obtaining the proper permits to manufacture tests for COVID-19, pregnancy and HIV, and mislabeling some of the kits.
Also note, the OP article is not originally from AOL. AOL is quoting another article from a "Scripps News", practically in its entirety without any additional journalism on their part. If they had done any journalism, they would have found the AP article I linked with more info or the DoJ article on the charges that were brought up.
Edit:
This story broke in July 25, 2023:
https://midvalleytimes.com/article/news/2023/07/25/investigation-on-reedley-building-uncovers-bio-health-hazards/
investigators discovered that one room of the warehouse was used to produce COVID-19 and pregnancy tests
Note, the words "test" or "tests" do not appear anywhere in the OP article.