"I infer from the context that ZGEN is defining cEVR as the intersection of RVR and EVR, i.e. undetectable virus at both 4 weeks and 12 weeks"
I don't - if anything the use of the term cEVR implies they are not including RVR in the definition, since subdividing EVRs into complete and partial (> 2 log drop at 12 weeks but not undetectable) emerged to help prognosticate SVRs specifically in situations where RVR was not achieved of course someone can contact the company to clarify, but my guess if RVR is a separate secondary endpoint