Most of them are placing a burdern on the Manufacturer of the products to release tools, documentations, parts, etc that allow independent repair, this type of right to repair would not in anyway be in conflict with DMCA, as DMCA allows manufacturers to release tools to "circumvent" their own production, what is illegal is a 3rd party releasing a tool with out manufacture/copyright holder agreement
Most state level right to repair laws say "Fine if you want to sell a device that does not allow for independent repair you product is not welcome in this state"
Thus no conflict with DMCA
There's still a lot of wiggle-room in there - Apple, for example, could argue that they're fine with "repair" being for things like replacing "dumb" iPhone components like the display and battery, but because the T2 security chip is an encapsulated, irreducible, atomic, component of the phone that being non-repairable is a design feature as that's how it protects the user's private data (and Apple's DRM...) they shouldn't be legally compelled to release the details of the T2 chip.
...or something.
You could probably cover a big chunk of the most common repairs without having to crack open or tamper with Apple's proprietary software like the T2.
That alone would be a huge win for the right to repair movement.