Did they run this test with anything but 720p low settings? if a person plans to game and they have a 1080p monitor/screen for example, would the AMD still be putting out the same performance once the CPU is no longer the bottleneck?
Problem could be system ram/CPU. they say 2666 RAM but is it running at that for AMD?
The chart is messed up and there really is no reason for it to be that way. A charting software would not do that for sure so someone messed up with it. Even the iris pro 6200 is beyond where it should be.
ultimately you aren't going to be comparing these directly. one is almost 3 x the cost of the other.
Increasing the demand on anything will not yield in better performance. If it's a CPU bottleneck and you increase settings, you are not reducing CPU load, you're merely putting an additional load on the GPU the CPU load will be there all the same. The best you can hope to do if you have GPU power to spare, is achieve better visuals without losing any additional performance, but you will not gain performance.
EDIT: Also, as it relates to integrated graphics, increasing any settings, be it a GPU loading or CPU loading one, will most certainly reduce performance because both the CPU and GPU have a shared resource, that being memory bandwidth. edram equipped IGP's go a long way to alleviate this, so it would likely be even more advantageous for Intel over AMD.