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I've measured 11-15W idle power usage on a Deskmini X300 with a Ryzen 7 5700G, which is not bad for a socketed desktop CPU.

Then you need to look at motherboard power usage, that's another huge difference if CPU is already taking just few watts

Even desktop CPUs, at least Intel ones, sip power when idle (anecdote: my 12700K sips around 7W when idle).

If that's the CPU's own power consumption as measured by the CPU something is broken in your system or you have redefined "idle". When these things hit PC6—all cores off, caches off, iGPU refresh off—they should fall below 1W. This is a typical idle state for a desktop computer that is nominally "on" but nothing is happening.

Idle as in sitting on the desktop doing practically nothing except for very minor and insignificant background tasks.