No the ram does no processing.
You are absolutely right about what the cpu and ram do and dont do. That hasnt changed.
However, on zen architectures only, the speed of the ram directly influences the speed of the internal interconnect within the cpu which is called the infinity fabric.
Its like, you turn up the speed of the ram and the cpu is aware of this, so it automatically turns up the speed of its internal communication channels to match it. The two arent linked, but the speed of the ram informs the speed of the infinity fabric within the cpu.
So faster ram = faster infinity fabric.
The ram doesnt take on any processing.
This extra speed within the cpu in response to the increase in ram speed results in lower latency within the cpu.
The article i linked to earlier explains it better than i can. Sorry if i've not explained it well. I'm on mobile and trying to do dinner and be with the family at the same time.