This was also a concern of mine. Not knowing too much about aerodynamics I can't be certain but I think some airflow should be going through the hole. You may a

This was also a concern of mine. Not knowing too much about aerodynamics I can't be certain but I think some airflow should be going through the hole. You may also have noticed that the screw standoff for the SSD is pushed as far out to the left of the PCB to allow for more air to pass on the right side. But I have at least not noticed any negative cooling performance :) Thanks for your comment!