On their first goal I can see your point, looking at the goal again had he pressed with real intent probably the goal doesn't happen.
I don't see it as much in terms of valid criticism at this point though. I'm sure there were many instances of all of our midfielders defending in a similar way. KWP had barely crossed the half way line. As a team we don't frantically press in those situations, if Mourinho wants us to it's not being executed by anyone really.
We were organised in a fairly low block. It's up to our defenders to deal with balls over the top. Track runners, stay right side. That being said it took a very well weighted pass and a sublime first touch along with a very good finish to make it happen. Some blame to go around, very little to Ndombele, a lot of credit to KWP and Ings.