From that link:
What we don't know (yet) is this: where exactly along that road, video evidence picks up a vehicle following Tim's truck. If we knew the exact physical location of that video camera, that would certainly narrow it down but we don't have that - that I'm aware of?
I've never physically been on that road but I've taken my google street view guy down it a hundred times or more in the last 3 years. It looks pretty much identical to any country road in southern Ontario - houses, barns, fields, silos, creeks, ponds, driveways, laneways, field entry ways, shoulders with wide pull out areas, etc. Multiple places to pull a vehicle off the road, park and walk to wherever. Likewise, multiple places to pull over and let a passenger out to get into another vehicle. Depending on how far down the road that video camera was, it would have been ridiculously easy for them to pull off and one of them get back in the same vehicle they arrived in and keep going, before video footage ever spotted either vehicle.