I'm not sure what i should be looking at in that picture.
I have already sent you a link showing 12600 idling at 57W vs 12600k idling at 55W. I really don't know where you came up with 10W from.
As for manufacturers not being able to meet the 60W idle power, that's more about systems going crazy. I mean W1zzard's system seems to have no problem meeting that and it's pretty extreme with 32GB RAM, one one the most featureful motherboard, high-end CPU and GPU, water cooling at whatnot.
60W idle power... When I started building PCs, our only choice was between a 200W or a 240/250W PSU.
Not to mention that those tests are run with a 1200W PSU that ...
well, doesn't perform admirably at idle (that's the 1000W version - the 1200W version is likely even less efficient at low loads).
That graph tells us that its efficiency in the ~50W output range (either 12V, minor rails, or a mix) is in the 70-75% efficiency range. As this is for DC output wattage, for a 57W AC idle reading, assuming a best-case 75% efficiency, that's 57/100*75=42.75W DC power, at that point - but more importantly,
a quarter of the power wasted as PSU losses.
For comparison, the ATX 3.0 PSU standard requires 60% efficiency from 10W or 2% output power, and recommends 70% at that level, where this PSU scores less than 60% in the linked review above. And as no PSU has a flat efficiency curve at its extreme low end, efficiency would still rise rapidly from this 10W point. In other words, these test setups
are compliant, and are using older PSU designs than the most recent standard, which will further lower idle power draw through lowered PSU losses. If that same 42.75W DC draw saw 85% efficiency rather than 75, the AC load would be just 50W, or 53.4W at 80%. These clearly aren't massive differences, but are more than enough to ensure that a PC like this is perfectly compliant for years to come.
I don't think it's possible to go much further than this without starting to power gate entire AICs or onboard controllers on idle, which would be .... well, troublesome in practice. But these levels are perfectly attainable with even high end hardware today.