All we can do is make assumptions based on logical thinking. If we stick with the tier system, it's likely that they have all sorts of monitor detail levels where the higher level tiers use more computational resources and therefore only used for a very small group of characters. In general, the first tier will most likely be things like hours of play time, break times and activity. This costs very little resources to track and compute. For example, a new account, that is playing 10 hours a day doing only activities that have a very high banrate, no quests or talking etc. Second level tier might then actually compare behaviour of the activities.
Imagine a woodcutting script that performs the same actions in the same order: bank, walk to first tree, chop first tree, walk to second tree, chop second tree, walk to third tree, chop third tree, eat rinse and repeat. Anti-ban is only checked between certain actions, making that an easy to detect pattern as well. Then when a bird nest appears, it will immediately grab it. When a tree spirit appears or an ent, it will immediately react to it.
Normal players tend to perform their actions by a similar pattern. But these patterns are different every once in a while and most certainly will be different from other players. The key in making scripts less detectable is breaking patterns but also trying to achieve a certain difference between different players based on a profile. The more difference there is between two players using two scripts, the less likely it is their machine learning technology is able to identify another player using the same script as using that same script.
But then again, it is possible that once you get in to a higher level tier, they start creating profiles based on mouse movements. These profiles can be compared and identified as similar. So that means there is definitely work on our side to be done as well to make key elements of our bot perform different for each player as well, like mouse, keyboard and interactions. I think if both parties can improve on this, together with the mirror client, we might make a jump ahead in the cat and mouse game on which we have been behind for some time now.