The most interesting part of this sequence is Cooper's demand to "Slow down. Stabilize the plane." It tells me that Cooper recognized the problem deploying the stairs and knew the solution. He strikes me as perfectly comfortable and in control at this moment. He knew the 727 well.
Regarding the portion about crossing the Columbia: My question is, how could the guys in the cockpit know this? How could the Columbia have been visible? Furthermore, they are recollecting an event that occurred--5 minutes, 10 minutes, perhaps even longer--earlier.
That said, if Cooper was a no-pull, presumably it would have to have been in the river or directly into Tena Bar. I'm not certain anyone could derive a position that precise based upon the above discussion among the pilots.
On the other hand, if Cooper survived and walked away, it really wouldn't matter where he landed. He could have landed near Lake Tahoe and found his way back to Tena to bury the cash. The problem with this is that it's too much of a coincidence.
Given that the jet flew over, or very near, Tena Bar, and that this occurred right about the time of the "bump", and that the money was found on Tena Bar, strongly suggests that Cooper touched Mother Earth either dead (Robert99) or alive (EU) on or near Tena Bar on November 24, 1971.