Ok you're making no sense to me at all.
Nketiah gets to the ball first and gets the shot away. He wasn't moving towards Ederson, he was moving towards the ball. Ederson is approaching him from the side in order to block the shot. He fails to do this and collides with Nketiah before his feet have touched the ground after taking the shot on.
But Nketiah already finished before Ederson hit him. The ball would never go into goal and Nketiah was on his way over the backline. It should never be a penalty. Or rather yes maybe its a pen but not when its normally never given.