Correct power calculation for booth mono and triphased

I saw the tricks of multiplying by 3 the L1 power phasis, but when you have then a charge in mono calculation is wrong.

There is this guy that posted a really interesting solution involving wiring differently the L1 L2 L3 through the core, and no code change on EVSE.

https://www.stuartgraves.info/measuring-3-phase-current-in-openevse/

I haven’t saw any discussion about it yet, but if there’s no cons shouldn’t we do this on all default 3phazed openevse from now?