If you don’t define a #21 ranking as top rate, then you will be critical of the metrics. The retention rate seems inconsistent with the Princeton study that ranked Emory #1 in campus life.
The statistics used were from the Class of 2021. The Class of 2022 had stronger stats comparatively when it comes to 2021. If you do see a bump, it would be next year. One of the reasons for the large classes at Emory (even more so Oxford) is the quality of the admits. They might need to get tougher on admissions for Class of 2023.