I think you have a fundamental misunderstanding of what "inflation" means as an economics term. Inflation only refers to buying power: when inflation is high, buying power increases at a slower rate than the average price of goods. When inflation is low, your buying power (per unit currency) remains steady or slightly increases compared to the rate of increase of price of goods.
Imagine a hypothetical scenario where all RMT activity (bots, gil buying, account hacking, tellspam, etc.) were completely eliminated tomorrow by some magical force. What do you think would happen? RMT botting activity causes inflation because it injects massive amounts of gil into circulation, as well as trivializing the supply of certain basic goods like shards, fleece, etc. It also allows the buyers of RMT gil to compete to pay a premium for certain extremely high-end luxury items like rare minions, HQ crafted equipment, materia for melds, the prices of which are all driven up by pent-up demand and surplus of gil concentrated in the hands of the "rich". If all RMT were eliminated instantly, it would have a complex impact on the economy in which low level basic goods like shards and fleece would increase in price and extreme luxury items would decrease in price as a result of natural redistribution of wealth through "normal" commerce. It's easy to misconstrue that Runescape forum thread to suggest that the introduction of Bonds caused inflation, when in reality, it merely caused the economy to normalize itself along producer and consumer lines. Currently, it's impossible to make a profit in FFXIV by producing low level goods because you're instantly out-competed by RMT bots who can afford to undercut you forever. If all bots are eliminated, the price of shards would invariably go up (this is not "inflation") since it would now actually require effort on the part of real players to produce this basic good. However, this ultimately stimulates the economy because the players who go through this effort are rewarded with larger profits than before.
I still see people perpetuating the myth that PLEX could be easily defeated by RMT if the RMT merely lowered their prices. It doesn't work that way. Are you mad when you get undercut 5 minutes after putting something up on the Market Board? By putting players in competition with RMT, you have every single PLEX-buying player in direct competition with RMT who will undercut the living hell out of the RMT constantly. THAT's why PLEX beats RMT.