I assume the canoeing is generally done downstream? Because they do up to 80 km per day. Unfortunately the article does not state in which direction the river is flowing? And what the speed is?
It's a little bit below 10km/h in the upper part. The itinerary suggests that they're going 'with' the flow. I think making any progress against the current would be basically impossible.
If you ever canoed you will know 80km upstream for 2 months with loaded canoe is impossible for regular humans.
As for direction of flow, just look at the map, not sure why people post questions online that can be answered in 5s googling, its freely available info.
