Dimensional analysis derives frequency with other Planck Units.
Planck units do not curve space because potential energies and kinetic energies are equal.
ZPE is derived from kinetic energies (1/2)hf and would curve space backward if not balanced by an equal potential energy. Something is missing from ZPE explanation.
One possible explanation is that Planck energy kinetic half accounts for ZPE while providing the potential energy balance. Casimir forces are suggesting excess of kinetic energy.
In ZPE Are The Frequencies Defined By Planck Units?