Yeah there's plenty of ways statistics can be skewed one way or another. For example, perhaps the "accidents on descent" wisdom refers to "mountain" objectives (where there is an actual descent to deal with, and it might be different from the ascent route) and the stats in this post might include all climbing, where indoor climbing (including top ropr and auto-belays) and sport climbing might not have so much of a descent, you're just sitting down in the rope and that's it.

And this is why I'm not a big fan of infographics like the one we see here. It looks nice, but it's actually quite hard to understand what it's actually saying.