According to the graph in the post (https://miro.medium.com/max/6088/1*tzpAFvuxVeumWO8ENz_SZg.pn...), it's somewhere around 0.0961 as of that time, and I suppose the price oracle they're using rounds that down to zero, perhaps? Or maybe the contract is rounding it down? Either way, I agree it's odd that exactly zero would be reported even if it's very close to zero.

edit: Nevermind, I misread. It's -0.0961, apparently.