I have a hard time believing that system only has 6W total power draw.

A friend did that with a ThinkPad x200 over a decade ago, so I can believe it easily.

You should have a much harder time believing a Pi 5 draws 25w in this comparison. 6w from a small form factor N4000 Intel system is perfectly achievable.

An N4000 provides about half the CPU performance (single threaded), and half the cores that a Pi 5 has.

However, the N100s are very competitive. Maybe even faster and cheaper, and less power hungry.