Any inflation index is based on a static measurement of currency. In Argentina the "IPC" tracks what 1 peso buys today vs tomorrow. In the USA the CPI tracks what 1 USD buys today vs tomorrow.
The problem with Expats is that they are trying to apply a
dynamic measurement of currency (USD<--->Peso) to a static index (ICL), which is fundamentally flawed. Because your 1 peso today may be a different peso tomorrow depending on what your 1 USD is worth.
Here you can see that from January to April your inflation accelerated by 8%, and then decelerated from April to July.
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This is why trying to calculate any annual inflation is a useless measurement for Expats because using an end of the year exchange rate value doesn't accurately reflect what the cost during the year actually was at the time of purchase.
Expats, who in the past could enjoy an exchange rate that always went up and largely kept pace with local inflation could reasonably plan a monthly budget. Today it's a crap shoot that only oscillates between "steady" erosion of USD purchasing power and "alarming" erosion of USD purchasing power.