Cassaigne et al.'s sign-change conjecture for the Liouville function

Let $f(x)\in\mathbb{Z}[x]$. Suppose that there are no integer $b$ and $g(x)\in\mathbb{Z}[x]$ such that

$$f(x)=b(g(x))^2.$$

Cassaigne et al.'s conjecture. The values $\lambda(f(n))$ change sign infinitely often.

This conjecture concerns sign changes of the Liouville function along polynomial sequences. The paper's abstract states that the special case $f(n)=n^2+d$, for every non-zero integer $d$, is proved, while the general conjecture remains open.