Before you get too heated I suggset you accept that WK was talking 330/340 and, in that case at least, he is absolutely correct according to 1.27.50 p5... and I hope you are joking about the rest of your post or limit yourself to flightsim...
This is becoming like the film "The Duellists" based on a pointless argument between two people.
1/. Mother. If you T/O with MTOW and decide to land back at the Dep airport almost immediately due to a very sick passenger, with a heart attack say, thne you would be a tad under MTOW and over MLW . . ne est pas?
2/. The clever design of the A320 allows for this - hence my statement - if, if, in this situation you decide to land then the weight you have is the weight you will land with
3/ there being no "dump" facility on the A320 - as you know..
the above scenario - which gave the basis of the question in the first place relating, to, an overweight g/a.