Another fascinating point is it’s not tradition to do the Vulcan salute to a non-Vulcan of which none of the characters on screen were so it’s strange he’d use that salute when not referencing anything Vulcan in the scene.
The thing is… the Vulcan salute is palm out. He has palm in, thumb in. It caught me off guard which was why I felt the need to come post as I couldn’t find it anywhere online.