Not sure if you are cherry picking that example, but I looked up that cereal in my local grocery store in a VHCOL area and it is $6.99/23oz ($0.30/oz).
I point this out because it always seems weird to me that discussing housing / utilities / healthcare / education costs somehow get boiled down to grocery store pricing disparities, when grocery stores allow you to comparison shop (and real estate / electricity / oil / etc don't).
Real inflation is what happens when my behavior doesn’t change at all, but my costs increase.
If I keep making adjustments to my behaviors then I’m just trying to counteract inflation, it doesn’t mean inflation isn’t happening.