I think this theory is plausible...Texting would clearly show if he said i live somewhere else now, just go to hatch park and i'll make my way over there. however, this would have had to have happened while she was still at the airport, since we know she requested the Lyft while at the airport to go to the park. So it still begs the question why he wouldn't drive straight to the airport to pick her up and tell her to forget the Lyft altogether? But maybe he's just selfish and cheap and was closer to the park and didn't want to actually bother driving a few extra miles to the airport.
I still think it was a careful conscious choice to avoid being seen at a public, well-lit place with working camera, though.