No points are given for skill assessment, but you're using it to calculate number of skilled employment years. In your case I suppose you had 5-7 years on top of the 6 years deducted by ACS as "hands-on qualification".
Update: now I have noticed the table from your post. You get the 10 points for equivalention of your diploma. You did that with other body (e.g. VETASSESS), isn't it?