Well, they are usually home for several months before the finale...sometimes 6 months, sometimes I think even more, or less, but definitely not usually just one or two, so presumably that was a comment made near the time they were planning to go home. That could mean that Jeff was still on the show near the time they leave to go home... if so they must have planned to train together before she left. So they could be competing for the at home prize, or she could be competing for that and he for TBL prize, depending, but either way they could encourage each other and prevent backsliding in the food department.
I also thought there was something very odd about that challenge...the timing made zero sense, but why on earth did they say anything about there being 2 minutes left, when it was so obvious that they couldn't make it in two minutes? If they hadn't said that, or had cut that comment with editing we wouldn't all be crying foul.