The cabling formula for GM series

Let $K$ be a knot with a well-defined GM series, and let $C_{(tp,sp)}(K)$ denote its $(tp,sp)$-cabling with $\gcd(s,t)=1$. Cabling Formula. The cabling formula above holds for any knot with a well-defined GM series, so long as the right-hand side converges. The source proves the formula for plumbed knots and conjectures its extension to arbitrary knots; convergence remains required.