This has been clarified by the actual presentation: X670E gets PCIe 5 on all CPU links, X670 gets PCIe 5 on the first slot and storage, B650 gets PCIe 5 only on storage.
Of course, the chipset itself has nothing to do with what connectivity is provided to the PEG slots since those run straight to the CPU - this is market segmentation in action, the CPU simply won't turn on those feature-bits if you don't pay for the premium chipset.
Also, as noted, on AMD the chipset has nothing to do with anything anyway. It is just an IO expander, it doesn't boot the CPU or do anything like that, and it is entirely uninvolved, out of the loop entirely, when the CPU is talking to things that are attached to PEG direct lanes.
Of course, the chipset itself has nothing to do with what connectivity is provided to the PEG slots since those run straight to the CPU - this is market segmentation in action, the CPU simply won't turn on those feature-bits if you don't pay for the premium chipset.
Also, as noted, on AMD the chipset has nothing to do with anything anyway. It is just an IO expander, it doesn't boot the CPU or do anything like that, and it is entirely uninvolved, out of the loop entirely, when the CPU is talking to things that are attached to PEG direct lanes.