On its face that seems impossible to be true. Given any bet you could calculate the probability that the bot would fold given an all in raise if you had perfect knowledge of the bot and abuse it
The short of it though is there exists a perfect range of cards the bot can play where it neither folds enough for you to bluff to gain an edge, nor does it call enough that you can wait for better cards while bleeding chips to gain an edge.
I say this despite also claiming the top DL bot does this anyway and does very well.