Elliott's conjecture for correlations of non-pretentious completely multiplicative functions

Let $\mathcal{M}$ be the set of multiplicative functions $f:\mathbb{N}\to\mathbb{C}$ with $|f(n)|\leq 1$. For $f,g\in\mathcal{M}$, define

$$\mathbb{D}(f,g;x)=\left(\sum_{p\leq x}\frac{1-\operatorname{Re}(f(p)\overline{g(p)})}{p}\right)^{1/2}.$$

A function is non-pretentious when it is not at bounded distance from any twisted Dirichlet character $\chi(n)n^{it}$. Elliott's conjecture. For fixed $a_i,b_i,N\in\mathbb{N}$ satisfying $a_ib_j\neq a_jb_i$ whenever $i\neq j$, if $f\in\mathcal{M}'$ is non-pretentious, then

$$\sum_{n\leq x}\prod_{i=1}^{N}f(a_in+b_i)=o(x).$$

This is presented as an Elliott-type correlation conjecture; the supplied material gives no resolution status, so it remains open.