You are missing nothing, its just that modern molecular biology has somewhat changed in what it regards as epigentics. Now, we usually refer to any somewhat las

You are missing nothing, its just that modern molecular biology has somewhat changed in what it regards as epigentics. Now, we usually refer to any somewhat lasting changes (a few cell cycles, sometimes just for a cell phase) to DNA as epigentic. This change in meaning has happend (as far as I understand it) because some of the somewhat traditional epigentic marks (like DNA methylation) have been found to play an even bigger role in relatively short time processes. Now almost all base modifications of DNA (and the bound nucleosomes) are regarded as epigenetic (in the sense of temporal genetic changes) even though the appearing changes are not really short term inheritance reasoned anymore but mere functional changes. And now, the whole story is becoming even more confusing because those base modifications also happend in RNA (transcribed DNA) which lead to the term epitranscriptomics, which to be honstest, has nothing to do anymore with inheritance, it is just about how a RNA molecule interacts with other cell processes.