That poll was conducted by Muslims for Muslims, hence likely more reliable than any of those conducted by the fake news media outlets and pollsters (98% chances of winning for Crooked Hillary in 2016, for example) in the West, because Muslim responders had no reason to use taqiyya against fellow Muslims as they often do against the kaffir. You are correct that non-violent Muslims exist but they are the small minority, not the majority Sunni nor Shia.
That poll was conducted by Muslims for Muslims, hence likely more reliable than any of those conducted by the fake news media outlets and pollsters (98% chances of winning for Crooked Hillary in 2016, for example) in the West, because Muslim responders had no reason to use taqiyya against fellow Muslims as they often do against the kaffir. You are correct that non-violent Muslims exist but they are the small minority, not the majority Sunni nor Shia.