I don't think anyone that posted after the official answer understood what they most likely meant.

They said loot distribution is off in coil for the two chest. Basically, the comment suggests that it may seem harder to obtain loot for a specific class because most of their drop are concentrated in a single chest (especially if the loot table of that chest is bigger than the other). They did not say anything that justify people whining that they have not seen x or y gear in z runs of "insert dungeon or whatever here". This is just rng and people complaining for the sake of complaining.