How are they criticising how we defend when we kept a clean sheet, and when our style of defending is central to how we play?
That's the incredible bit. If we constantly dropped points because of the defence, then they'd have a valid point. If the high line didn't provide the platform for our press, they'd be able to question its usefulness.
Like zonal marking, it's criticised as a system when an error is made. However, it's not praised when it works. When man-to-man marking fails it's blamed on an individual error, when someone scores against zonal marking, it's never individual error - it's the system's fault.
Every time we catch someone offside, or extinguish an attack, or indeed successfully press the opposition, then nothing is said about the high line.
The argument through incredulity is dished out by ex-players who basically don't understand what's happening on the pitch in front of them. It highlights their ignorance more than anything else.