Because you aren't asking the same person the same question over and over again, and in fact only have a single data point for each person, there is no way to "infer the result, the true signal": the "plausible deniability" this yields isn't just a psychological trick, but is actually mathematically sound; in the end you can determine things about the population as a whole, but you cannot determine who was forced to say "yes" and who volunteered a "yes".
I've gotten a sufficiently large number of upvotes from this comment that I feel compelled to follow up after having gotten a (half) night's sleep: you are asking the pollee multiple /different/ questions, and if there are correpations between the answers (which the poller suspected to bd the case in this article) you actually can deduce information about each individual sith increasingly high probability ". If this what the person I responded to meant by "true signal", then he is correct.
