40 years ago or so, I taught those same remedial classes to freshmen students at a large Midwestern land-grant 4-year university. The only reason my pass rate was higher than 44% was because I felt sorry for the kids. I was then, and am now still considered a good instructor. Most of those students had no business being in college in the first place, and I could tell that few if any would finish regardless of how I graded them. Remember, these are students who were unable to pass the basic requirements coming out of high school. Not representative of the population as a whole.
I suspect the "online-edness" of these classes has very little to do with it.