Got curious and went to the original page, and it is literally just one sentence vague announcement:

Due to Google’s alleged violation of the “Anti-Monopoly Law of the People’s Republic of China,” the State Administration for Market Regulation has lawfully initiated an investigation into Google.

Really not sure what they actually launched the antitrust probe for; this is just pure political drama lol

Edit: Okay, it is possibly because of Android dominance, but again, still a political drama