Regarding this specific case, the analysis is sound. It is the majority opinion on Myanmar, but that majority opinion is held for good reason, e.g. China's desi

Regarding this specific case, the analysis is sound. It is the majority opinion on Myanmar, but that majority opinion is held for good reason, e.g. China's desire to keep Myanmar together, complicated ethnic boundaries, desires of current EAOs. The % responses adding up to over 100 makes sense, because the 25% outcome (formal secession attempt) and the 10% outcome (completed secession) could both occur, so it's implying that if secession is formally attempted, there's a 40% chance it will be completed. The numbers are broken down more clearly at the end - it is a bit confusing at first glance though.