They need $7,500 per resident and, according to the article, they intend to raise that money over three years. I don't know what their property values are like but if I assume an average house price of $300k, a current tax rate of 2%, and three people per house then they're currently getting $6,000 in property taxes per person over three years (which they need to spend on other things) and so an enormous tax increase really is necessary.
(I'm neglecting non-residential property tax payers. A tiny town like this probably doesn't have many.)