No, all barostats in GROMACS are correct.
There is an issue with incorrect pressures, as noted by the preprint you refer to. But this issue is limited to systems without electrostatic interactions or very weak electrostatic interactions. So nearly all atomisitic simulations are unaffected.
There is an issue for this which we are working on: Too high pressure due to missing dispersion interactions in systems with no or weak electrostatics (#4861) · Issues · GROMACS / GROMACS · GitLab