It seems to me that this would really hinder proper form. Based on how the length of the monopod is set, you may find that due to a small dip in the ground or a bump, you don't achieve the proper bow arm position. This could and probably will lead to a messed up anchor and a number of other factors to compensate.

I will not knock them for trying to make some money, but proper form and accuracy is about getting the proper tension in your upper body. This seems that under optimal conditions (i.e. shooting at a range) that might be possible, but in the field, it seems pretty unlikely.