They indeed refused to implement PFS at some point, and even had some logical explanation for this decision (can't recall what exactly it was, unfortunately, I guess it was somehow related to codebase ties with Oxen implementation). As of now, they've split from OX blockchain and they do indeed use extended triple Diffie-Hellman agreement (==PFS) in recent (1 year?) versions. What other features are lacking?

I have my issues with the migration in the first place, but it's good to know that PFS is planned. The remaining flaws are all in the chart- I believe the article I linked goes over them in more detail