I just passed Steam cert, and the fix for this was actually pretty straightforward - they don’t want you ever running the redist installer at all, Steam wants to handle the redists itself. So what you want to do is tell Steam to launch your “YourGame-Win64-Shipping.exe”, which is in Binaries, not YourGame.exe. Then you tell Steam which redists you need (which is the top two checkboxes).
No custom build required!