The <30 eGFR reference is from the 'Patient exclusions' section.   

The second last page offers the eGFR answer we have been waiting for, imo.
Not sure why RVX IR referred to eGFR data as "sensitive" given that it looks like a nothingburger according to the following item (my bolding)

Limitations of the CKD Study
• Relatively small portion of the parent trial: 288 CKD patients out of 2,425
• Less balanced randomization among 288 CKD patients
• Limited to CKD Stages 3a and 3b (given exclusion criteria of eGFR<30 ml/min/1.73) • Lack of urine data: No albuminuria data were collected
• eGFR changes over time were not different
• Non-diabetic CKD patients were not studied