Confusion in 2012 paper by Austrin and Håstad regarding hardness of approximating GLST
Following Emil's suggestion and using trial and error, define $P'(x_1, x_2, x_3, x_4) \equiv P(-x_1, x_2, x_3, x_4)$

Instances of $\text{CSP}(P')$ are isomorphic to instances of $\text{CSP}(P)$, via adding a negation in every constraint where $x_1$ appears. Then we apply the theorem on $P'$ after checking that the $\{3,4\}$ fourier coefficient is still positive. We can conclude $P'$ is resistant and therefore $P$ is as well.