You could buy a Linux based NAS and install Pytivo on it to serve video to your TiVo.
The TiVo does not speak DLNA nor does it natively display many of the formats DLNA transmits.
Current : Roamio Base with 2TB drive and 2 Premieres and a mini. OTA. kmttg, pyTivo, running with a 78TB Synology 1511 NAS....serving up the world.
Setup help for pytivo under windows:
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