That wasn't for desktop graphics, it was for a top-end laptop graphics SKU (I think RTX 3080 Mobile on a ~135W-150W TDP configuration?). Otherwise the graph would extend all the way to 360W for a RTX 3090.
And I think based on these numbers that a desktop 3090 would have well over double the performance of the M1 Max. It's apples to oranges, but lets not go crazy just yet.
Now, I am extremely excited to see what they will come up with for the Mac Pro with a desktop thermal budget. That might just blow everything else by any manufacturer completely out of the water.
The chart only shows a line up to about 105W, so it's not clear what they're trying to represent there. (Not that there's any question this seems to be way more efficient!)
