Hi.
A little bit of background on the source of the TiVo guide data may help.
Your TiVo downloads guide data from a server in Australia which also has the Australian data. The actual source of the data is from NZ although I'm unsure who is generating this and it appears to be running on autopilot. In the case of the Aus data source David Keegel was trying to keep things running however he hadn't been provided with all the "operating instructions" so had problems adding channels etc. to the Aus guide. He couldn't do anything directly to the NZ guide.
Try sending a PM to DavidKeegel, DJC (a senior forum member in NZ), tenty or Darren King who might be able to pass on a message to the right place.
As has been mentioned often the TiVo support is done by volunteers and although there are still users it is a bit of a legacy project with people moving on to other things.

I hope this has provided a bit of background although not directly solving the current issue may be useful.