Comment on the paper "Direct and inverse problems for a third order self-adjoint differential operator with periodic boundary conditions and nonlocal potential"

This comment shows that the main results of [Y. Liu and J. Yan, Results Math. (2024) 79:21] immediately follow from the abstract results of [O. Dobosevich and R. Hryniv, Integr. Equ. Oper. Theory (2021) 93:18].