Do you have any good explanation why should it be Milliwatts? I am having here an older ZynQ project with 2 ARM cores running normal operating system and image

Do you have any good explanation why should it be Milliwatts? I am having here an older ZynQ project with 2 ARM cores running normal operating system and image processing part written in VHDL. 7 Watts. But it is normal computer with normal operating system. It’s on par with typical Raspberry Pi consumption.