I used that remote many years ago. And while I use my Harmonies for many things, I now just use the TiVo RF Slide remotes and use one for each TiVo/ Mini instead of using IR with my Harmony. But as far as I know you can duplicate every button press of the regular TiVo remote with the Harmony.
TiVo Mini x4
Roamio Basic OTA
40TB unRAID1--53TB unRAID2--36TB unRAID3