Regarding Hilchos L”H, even if you think it’s okay because it’s for the greater good, one of the first conditions is that you have to discuss it with the person first. Before throwing out this issue to the whole world online, you should be writing to the editors of the book, and ASKING them why they did it.
Second of all, you have to be sure of your information; you have to know for a fact that it is true. You have to consider if it is possible that there can be another explanation. You are assuming that they did this in order to be deceptive and that in fact, according to halacha it is considered deception and is assur. Do you know 100% for sure that that is their intention? Do you know for sure that it is assur according to halacha? If not, it is assur to say so.
Third of all, what is the greater good here? Is it always for the greater good to talk about what others did wrong? If so, then there would be no concept of LH, since everything would always be okay.
If the whole thing really bothers you so much, why don’t you write to them and ask them why they did it?
And if you think it’s a problem, discuss it with them and not with the rest of the world.