And? It does not say how many GPUs and it does give that only for ETH mining that have different algorithm so different amount of data received and sent to network. + by context he talks about GPU not GPUs and gives number of 150MB per 14 days so 300MB for GPU per month. That is year ago and does not specify what kind of GPU that is. So my statistics are quite close if my GPU requires 350MB per month as it might be faster then common GPU a year ago.
All your arguments are silly and does not hold if you analyse them so do not go and say my statistics are wrong. That is average from multiple rigs mining ZCash and it is in range of 340-360MB per card.
You give random numbers from random post a year ago "answered Apr 17 '16 at 22:18" I gave specific number stating specific conditions from past month.