IANAL and I haven't dug into the text of the law beyond your quote, but I think the key here is "for reasons of non-compliance with national performance requirements relating to product parameters referred to in Annex I covered by performance requirements included in such delegated acts." To me this is saying "the standards for performance requirements laid out in Annex I override any requirements individual members laws indicate for the same parameters, so those requirements can no longer be used to require products to meet different requirements for these parameters"
So if you are refusing a product from the market for a parameter that is not referred to in Annex I and not a "performance" requirement, then that's theoretically allowed. Depending on the rest of the text, there's a good chance that this leaves room for right-to-repair requirements, unless Annex I already has repairability requirements defined, or unless the law is written to define "performance" in a way that includes repairability.
Ah, yes in that case it does indeed seem to suggest that an individual member state would be unable to unilaterally apply a stricter right-to-repair standard than what is specified elsewhere in this law.
While that does take some tools off the table for individual states to strengthen right to repair, the intention here does not seem to be a desire to prevent these measures, but to keep them standardized to keep trade between members smooth. Based on other EU legislation I'm aware of I suspect that the repairability standards they've laid out are far better than what I would find anywhere on my continent, and member states always have the option to work together to further strengthen these provisions across the Union.