Jia's strengthened Hardy–Littlewood conjecture for Goldbach representations

Let $R(n)$ denote the number of representations of an integer $n$ as a sum of two primes, and let $\varphi$ denote Euler's totient function. Jia's strengthened Hardy–Littlewood conjecture. Suppose that $x$ is sufficiently large and $q\leq x/4$. There exists an absolute constant $c_5>0$ such that, for the even integers $n$ satisfying $x/2<n\leq x$ and $q\mid n$,

$$R(n)\geq \frac{c_5n}{\varphi(n)}\cdot\frac{n}{\log^2 n}.$$

The source presents this as a stronger version of the weak Hardy–Littlewood conjecture and attributes its use in bounding Siegel zeros to Jia; the assertion itself remains unproved.