Question about hunting from ground vs stand

Brothers my local hunting club buddy and caretaker of our club was telling me today that he prefers to hunt from stands in the am and from the ground at night because the heat etc is typically coming off the ground and rising in the am so the deer can smell you better if u or on the ground whereas he hunts from the ground typically in the afternoon as the cooler air is coming in and typically displacing warmer air near the ground causing the scents etc to typically fall toward the ground so u r worst off in an elevated stand. I know bow hunters have warned me about scent traveling down from elevated stands before as well. What say ye ole timers and experts on here ?