Anyone that who has a reasonable understanding of computers would know that nothing other than dedicated GPU RAM (which Apple SoCs do not have) would make a system with less main RAM equivalent to a system with more main RAM (and only in certain workloads).
All claims that somehow the Apple SoC's "unified memory" makes them require less RAM are nothing less than bald face lies!
There is a post in r/hardware from just a few days ago showing that the hardware features only have a small impact on performance, not a "significant" one.