  This correspondence disproves the main results in the paper "Design of
Asymmetric Shift Operators for Efficient Decentralized Subspace Projection" by
S. Mollaebrahim and B. Beferull-Lozano. Counterexamples and counterproofs are
provided when applicable. A correction is suggested for some of the flaws.
However, it does not seem possible to amend most of the flaws since the overall
approach based on a Schur decomposition of the shift matrix does not appear to
be helpful to solve the desired problem.
