This is true, it seems like the infinity fabric limits how low AMD cpus can idle. Intel invested pretty heavily in power saving tech during their 4 core

One other thing that hurts AMD here was the x570 chipset. It seems to be a hack job, basically installing the I/O from the CPU upside down and running it as a chipset. IIRC it uses like double the wattage of the x470 chipset it replaced.