Their APUs don't have the problem from the reviews I've seen, but yes the I/O die has been the bane of the Zen platform when it comes to idle power consumption.

To make matters worse, the x570 chipset basically runs this I/O die upside down as a chipset and sucks twice as much power at idle as the x470 chipset it replaced. I expected them to replace this hack of a product used for the high end when Asmedia's efforts were delayed but all that platform got was B550. It was pretty clear they weren't chasing this part of the market during AM4's heydey, no real idea where they are at now with chipsets on AM5. But given few people talked about how crappy that chipset was in this respect I guess they might be right it wasn't important to most people.