Install Data Rescue and run it against the TM drive and output the files to another extenal drive.
Mind you there are a LOT of same name "placeholders" with no data, basically files with names, but no data.
Data Rescue works by accessing the drive directly and looking for files, even deleted ones.
It's going to be a chore and cost you $100, why I never user TimeMachine. Multiple bootable clones is superior, they are direct accessible and not via some goofball gimmicky software.