Looking at the chart, it appears to me to be poorly drawn. The 10 DME point appears to be on the 3 degree profile at 2500 feet.
Anyone else see the potential for starting descent at 10 miles instead of 8?
There are any number of approaches in Australia that have similar situations where the 3 degree final descent path starts after a DME step. I don't have access to non Australian charts to know whether this is unique to Aus or not.