The other attack points were bombarded for several hours. Not so with Omaha. Fact. Most of the German pillboxes and such were still intact..
You don't why that happened, so you just assume "treachery" without investigating.
Because, apparently, your baseline assumption is that highly complex war plans always unfold precisely as hoped for and if they don't then there must have been a conspiracy.
Have you heard of a general named Napoleon Bonaparte?