Earlier quoted context omitted.
Edited my comment when I saw this. This is exceedingly dangerous. Ask any rower that's worked with people on C2 machines. Everyone will instinctively throw the damper to setting 10, then throw their back due to bad posture.
I'm a former rower as well, I disagree that sitting on a rower is dangerous for getting back injury. Considering that pretty much every gym I know just puts them in some corner without anyone around who knows how to row, I believe this is not an issue. I know of no one who has injured themselves rowing (on a machine or outside).
I'm not saying these things are death machines or anything, but the concept of adding essentially seated row to a rowing machine is fairly dangerous. Throwing an air damper up to 10 and ripping on it for a couple minutes will leave you quite sore the next morning but adding high weight can start pulling muscles or slipping discs.