SVPtube cannot be triggered by a url like https://www.bilibili.com/bangumi/play/ep259712. There is a related open issue on youtube-dl github https://github.com/ytdl-org/youtube-dl/issues/15545, but it has remained unsolved for over 1 year.
According to a reply on this page, you-get support such kind of urls. I also found another opensource command-line tool "annie" support that.
Would you like to consider changing the backend of SVPtube or merging annie and you-get into it to extend the supported sites of SVPtube?