You are aware that this amount of intelligent sentences in one place is really difficult to digest? I feel rather intimidated. But I am trying to aline with the smart people here (cool by association), so I must comment something to make it look like I operated on your level and actually contributed to this conversation. So, to relate this post to your statement at all, I must ask: what is your conclusion now; did Solas lie or not?
Oh gosh, and here is Siha asking the most difficult question and calling me out, while pretending not to understand. Don't play dumb; I'm on to you.
I think you also read my post before I edited to add the part about subjectivity. Since my definition relies on what a listener would wish to know, or what sufficient justification for withholding information is, the answer depends on the individual recipient. Or perhaps is so relative as to render the question moot?
So, in short, I'm not certain that there is a right answer to that question. Did he lie? I don't know. I guess that depends on your point of view, at least using the definition I have provided. Which itself may not be entirely accurate. For me, personally? I think it was relevant information, but I'm guessing there was sufficient justification for failure to disclose. But, time --or the next game, DLC, etc-- will tell? In short, I have no certain opinion. Whatever his ultimate goal is, I find him to be a logical, ethical person in search of truth and liberty. If he didn't tell me something, I would think he had his reasons. Whenever I find out what they are, I may or may not agree with them. Who the hell knows! Apparently, not I.
Do I have to have the answers? It's so much easier to just ask the questions. 
(And the point asking questions is to consider possibilities, not necessarily to find an answer, if there even is one.)
I am too scared to chat with you guys LOL
Oh and for everyone: I am currently doing some SolasXAbelas smut fanart
Oh come now! We don't bite. Just giggle and talk smut. And if you're drawing smut, we'd love to watch if you want to screenshare.
Y'all too worried about whether the egg is lying or not. What you should be worried about is if he is any good in bed. If he butters your toast, fries your bacon, smothers you in gravy and bakes your biscuit.
At last, TRUTH. My search is over.