Coin Exploit

The thing is, unlike actual meso exploits, the sum total mesos on the server is unchanged. Which is what they're referring to. In the last meso exploit, hackers were giving themselves mesos, then buying out FM shops. That introduces vast swathes of mesos to the economy. This just introduces a few specific types of scrolls.

For that matter, I'd view it as a positive thing if merchants gave hackers hundreds of millions, and then the hackers got banned. The only way to improve the NX ratio is if mesos become worth more again.

It is never positive to fund the hacking community at the expense of legit players. And I believe the original topic was on the impact to the economy, which I gave sufficient examples of impact, some good, some bad. On the topic of impact, "improving the NX ratio" does not refute that it did not impact the economy, quite the contrary. In addition, the below quote may help show more impact, I did not watch the video, but the explanation seems on track.

That's not entirely true.

There's a reason they made all items 0 mesos.
Whether or not they realize that the above was happening is yet to be seen.

Yes, the rate of generation is relatively slow compared to old methods, but still miles and miles faster than normal accumulation.
Basically, people were scripting it so that they would generate max coins, then sell them, then generate max coins, and so on, all without moving (since the two NPCs required are right next to each other).