Dermot on Sky said this...
"The precedent has already been set with this earlier in the season with Steven Bergwijn and Ezgjan Alioski where we had a similar decision where the player's body is half in the area and half out and because he is partly in the area, it is deemed a penalty because that is how the foul is committed.
What you would say is the referee [Michael Oliver] has got a great view, the VAR [David Coote] checks if it is on the line, his body clearly breaks the line and therefore a penalty is given."