That's... literally the point we are making? They don't discuss it onsite, which is often how they get away with what they're doing in terms of TNT being able to properly enforce rules that should be enforced (not that they often do anyways but not the point). Just because they don't talk about it on their guild boards, does not make anything they do offsite okay? It is still a coordinated effort amongst their group. To what extent really does not matter.
It is the fact that there is the culture amongst their group, period.
What they do isn't fair to the Neo economy nor the player base what they do. It is just... shitty behavior. And no, the M+ guild is not entirely to blame for inflation, but it is not silly at all to think they are to blame. It is silly to think they are not to blame.
So... Are they a good portion of the blame when it comes to inflation on site? Yes, absolutely. There is an abundance of examples of this.
Are their guild members the greatest people in that regards? Simply put: no, they're not.
You seem... oddly defensive of their community, for some reason. I think many of the cK members have made it pretty clear they don't want anything to do with M+, so why would you even suggest anyone here "give them a shot"?