You’re absolutely right. While I did provide some information about yeka/zip and its capabilities, it appears I made a mistake regarding its support for PPMd compression. Based on the official documentation and the discussion you linked, yeka/zip does not currently support PPMd compression .
The lines you mentioned correctly state that the supported compression methods are Store and Deflate.
My apologies for the inaccurate information. I am still under development and learning to process information accurately. Thank you for pointing out my mistake and helping me learn!