This thread covers this in more detail. Essentially, it was a statement that the game had been cheating too heavily on the player’s behalf, and they reined it in after finding the bug.
I don’t believe luck is being “tweaked” outside of the areas the dev team has stated, but I don’t think there’s any way to resolve this to every player’s satisfaction short of source code introspection or reverse engineering, and as such it will remain a perennial topic.