The claim is strongly supported by the fetched article "Foreign Trading of Chinese Bonds via Hong Kong Hits Record High" on Financial Post, which reproduces Bloomberg reporting and gives the specific March figure of 1.22 trillion yuan ($179 billion) for Northbound Bond Connect. That source also says policy financial bonds and Chinese government bonds were the dominant categories, aligning with the user's description of yuan-denominated government and state-backed bonds traded through Hong Kong. The Bloomberg URL found in search corroborates the same title and figures, and the cited X post matches that reporting. Confidence is medium rather than high because the underlying Bond Connect Co. statement was referenced but not directly fetched in this run.