Really, so random that some dude posted exactlly what he would be selling today. Nailed it down to every item. What are the odds of that?

So how do you know they didn't roll the dice for this whole month weeks ago?

So how is it that DeeJ claimed that no idy knows what Xur brings until he arrives with the gear at the tower, but some dude can figure it out days in advanced? So what you are assuming is that Bungie rolled the dice, got random results for the next who know how many weeks, then assigned the results to set dates.