But you don't know that for sure......Your assuming they lied....Their version sounds more plausible if you really think about it
Actually, I don't think they deliberately lied (apart from the "from time to time" wording in the newsletter which is blatantly & demonstrably false).
But they have known about this for a long time (please, I'm an experienced software dev, I know how these things go), and a lie of omission is still a lie.
As to whether they lied during the KS to get people's money & they had no intention of delivering offline mode, that's another question. I'm more inclined to believe that to be a serious error in judgement.