I can be dense sometimes but I'm not understanding the problem. There is nothing about a decrease in these directions.
You are supposed to do short rows stopping 2 stitches short of the last ones each time until you are only ribbing across 16 in the middle. But that doesn't decrease anything. Are you having trouble with how to do the wrap and turn while stopping 2 short each time? Is that the issue?
There is a kind of short row that I recently learned about that prevents holes without doing a standard wrap. Here is a video link to instuctions for one type. You need to look at two videos, one for a purl and one for a knit, but you should be able to watch one and find the other from this link. These are by Rox.
Try this out and see if it helps.