I believe hn users who claim to be from argentina or somewhere near, that's it.
If I see one such comment, it might still be misleading but If it is tens of such people, it would be legit enough to believe.
You can't measure inflation via comments, cause inflation is a basket. People can say they see no change in prices because they don't buy everything in the basket, or the opposite.
For example, inflation where I live is ~10% but eggs have doubled in price in one year. It's not that the statistics office lies, it's just considering more things, and e.g. public transport had 0% inflation.