Norm conjecture for generalized Macdonald integral forms

Let $N$ be a positive integer, let $\vec{u}=(u_1,\ldots,u_N)$, and let $\vec{\lambda}=(\lambda^{(1)},\ldots,\lambda^{(N)})$ be an $N$-tuple of partitions. Write $e_N(\vec{u})=u_1u_2\cdots u_N$, and let $n(\lambda)$ denote the usual partition statistic. Let $N_{\lambda,\mu}(Q)$ be the Nekrasov factor. Generalized Macdonald norm conjecture. The integral-form vectors satisfy

$$\langle K_{\vec{\lambda}}|K_{\vec{\lambda}}\rangle=(-1)^N e_N(\vec{u})^{|\vec{\lambda}|}\prod_{i=1}^N t^{-Nn(\lambda^{(i)})}q^{Nn(\lambda^{(i)'})}u_i^{N|\lambda^{(i)}|}\prod_{i,j=1}^N N_{\lambda^{(i)},\lambda^{(j)}}(qu_i/(tu_j)).$$

This predicts that the norm reproduces the corresponding Nekrasov factor. The source marks the equality with a question mark and gives no resolution.