Biran decomposition and relative symplectic cohomology

Let $(M,ω)$ be a closed monotone integral symplectic manifold with monotonicity constant $τ>0$, and let $D\subset M$ be a symplectic hyperplane section of degree $0<k<τ$. By Biran's decomposition theorem, $M$ is the union of a symplectic disk bundle over $D$ and the skeleton of the complement $M\set