Cool cool, now realistically, do you have the time, resources and know how to find and contact every owner of every federated instance these comments have made to? Would you be able to deal with the legal resources of any number of jurisdictions to truly test whether that is actually enforceable?
My point basically is that it’s functionally impossible regardless of what the law says, and you should treat your comments and personal information as such that they won’t ever be able to be deleted or scrubbed.
Usually what I’ll do is I’ll recombine the folders into an iso file using mkisofs and then keep the ISO as it keeps all the menus and everything in tact. Later if you want, you can run that ISO through MakeMKV and just rip out an MKV of the main title through. But since I have enough disc space I just rip all my DVDs and BDs to straight ISOs to keep all the menus and extras in tact for later.