The "HCH2" at the end of the link is likely a codec or a format specification, which ensures that the video is encoded in a way that is compatible with a wide range of devices. The presence of such a link indicates that the content is available for streaming in high quality, with minimal compression or loss of detail.
The exact string typed into search engines breaks down into standardized digital video specifications: alltheseyears2023chinese1080pwebdlhch2 link