I am not sure I understand backside in this instance and the illustration in the article didn't entirely help. In general, at least in older time, one side of

I am not sure I understand backside in this instance and the illustration in the article didn't entirely help. In general, at least in older time, one side of the CPU has all the nice pins on it, and the motherboard has a pincushion that the pins match nicely. At the top of the CPU you put a HUGE heatsink on it and off you go. In this configuration the power delivery must be via the pincushion, through some of the pins. Intuitively that sounds to me like the power is coming in the backside? But given that it is a big deal I am missing something. Is the power fed from the "top" of the cpu where the heatsink would sit?