The TiVo has no idea that you have manually changed the channel using the Foxtel remote, this is why the channel ID has not changed.

When using a TiVo, take the batteries out of your fox remote and put it in the cupboard. It is dangerous to leave it active as someone may change the channel while it is recording your favourite show. If someone tries this with the TiVo remote it will give a warning and the choice if they want to continue.

From memory you can change the tuner with /sbin/palmod_config

Peter.