In this video one can see the rapid slowing underneath the airfoil:
This video discusses the pressure distribution around an airfoil:
I think the second video has an error as the distribution is of the pressure perpendicular to the surface. The high positive (negative-negative 1) at the front is pointing horizontally. to push the airfoil left to right. For thin airfoils at low angle of attack it's not too big a deal, but thick foils (Clark-Y) at high angles of attack the difference will be substantial. The rest is close enough.