When talking in general terms, sure, but I don't think they work for some of the specific questions they talked about in the podcast. The missionaries were engaging in multiple long meetings with them, so it's not like they didn't have the time to clear up any confusion over vague questions, and seeing how they ended up asking Ross and Carrie if they'd consider baptism, I don't think that the missionaries thought that they were trying to trip them up... not once they got beyond the initial stages, anyhow.
Carrie had one question that she asked several people, just because she never got a real answer: "what about intersex people?" She would ask that seeing the emphasis that the LDS Church places on gender, how it deals with people (millions of people) who don't fit neatly into either gender, both in terms of marriage on Earth as well as the plan for salvation.
I think that question is specific enough that it doesn't create the issues of vagueness you mentioned, and while I could understand that it's an uncommon enough question that a missionary might not be prepared for it immediately, they said they were repeatedly told things like "that's a good question. I don't have an answer for you know, but I'll do some research and get one for you for our next meeting"... except no answer would ever come; every meeting, they'd just get a promise that they'd get an answer later.
Or another specific example that I just picked up on re-listening to the podcast: Carrie talked about how during one meeting when the missionaries were discussing the plan of salvation, they were talking about the different groups of people in Heaven, and how in the Celestial Heaven, the "Exalted Ones" (if I have the term correct) would be granted worlds of their own along with their wives. Carrie pointed out to the missionaries that this arrangement makes a woman's fate dependent on the actions of another, which the missionaries said, in their argument against Original Sin, is unjust. She never got a good answer to that question either.
Those are the only specific examples I could find, but they did talk about how their missionaries would dance around questions. They said that one frequent refrain they'd get from one of their missionaries was "you know, there are some questions where it's good to spend your life searching for an answer, and others where you should just 'put it on the shelf' and grab it on the way up to Heaven to ask God. I think I'm going to put that question on the shelf."
If someone responded to my honest questions that way, I think it would drive me nuts. And I think that in cases where the person is asking an honest question that has a real answer, but the answer is kept from the person because the missionary has decided that the questioner doesn't "need" to know it yet, there is an element of misleadingness going on... especially when the missionary knows that his failure to answer the question directly will probably result in a false impression.