Which poll from the article (https://en.wikipedia.org/wiki/2014_Crimean_status_referendum) are you referring to exactly?And yet, in your very article you seem to ignore the pre-invasion poll from May 2013 that found a majority of the population wanted things to continue as they were, or surveys that found that a majority of Crimeans considered Ukraine to be their motherland.
The situation changed substantially after the ousting of the pro-Russian president Viktor Yanukovych in February 2014.