What is the thrust of this thread? The author appears to be taking umbrage at the 5% increase in inflation vs. 150-500% increases in various food items. However, inflation measures are commonly defined over a basket of goods and services, and price increases can vary greatly across individual items. In fact, is there are inflation indices that cover 'core' items, which should catch the scenario that the author is talking about. If they haven't (and I do not think they have), then this thread is mostly just a rant (the author is clear on this).
I think the point was to tell that the gap between low class and middle class has increased. If we take avg basket of low class - its price increased by much more % compared to middle class basket. (but the thread lacks actual numbers and it is based on authors perception)
Food prices may have been artificially low due to migrant labor utilization.