News Micron launches DDR5-6400 CUDIMMs and CSODIMMs for Intel Core Ultra 200S CPUs — DDR5-6400 kits up to 32GB capacity with C52 timings

It effectively removes the processor's integrated memory controller (IMC) from the equation, allowing CUDIMMs and CSODIMMs to run at the advertised speed regardless of the quality of the IMC.
I believe this is an overstatement. I'm no expert, but the main effect I think it has is to reduce clock jitter, which should lessen the difficulty on a CPU's IMC of handling higher speeds.

Also, thanks for reporting the speeds on existing CPUs and platforms.

I look forward to them launching an ECC version of this RAM.