Co-drivers
do often repeat calls in cases where there's going to be a tricky corner, or one where a big speed reduction is required, or in cases where (in the co-driver's opinion) the driver is not showing signs of making said speed reduction.

But some co-drivers also seem to repeat calls for reasons I can't see, and which was the case here I can't say for sure.
Here's
a much better version of the video (from the Vermont SportsCar site), with multiple views and text accounts from Travis, Christian, and Morgan (the photographer).
Watching the video more closely, the call seems a bit late. Christian calls "Crest 200 Caution Left 5- over crest into Right 4+". Assuming they were going around 120mph, it should've taken them 3.4 seconds to cover that 200 yard straight. But Christian repeats the call immediately, then an instant later they're crashing. I don't know how Travis likes his notes, but if it were Matthew (or me) driving, we'd want to hear the caution call back around the crest before the 200. It takes time to say all this stuff, and Christian doesn't even
start to read it until apparently 1/3 the way down the straight. The timing of the notes is the toughest part of a co-driver's job, IMO.
As for crashes due to driver error, sure, an apology is never going to be
inappropriate. In the video above, you can hear Travis give a quick apology on his way out the window and, knowing him, there was a
long string of apologies yet to come- to Christian, Lance (VT Sportscar), Team Subaru, and many others.
But rally folks, both drivers and co-drivers, in this country don't seem to be the primadonnas that the WRC guys are, and I think are generally more cool about stuff than what you describe. Of course there could be exceptions...