No such thing as a permanent change....if it’s continuing to change.
Of course change can be permanent.
The earth’s land surface used to be universally dry, with all water molecules suspended in the atmosphere as vapor. At some point, the atmosphere was unable to hold all of eatrh’s water molecujles as vapor and the oceans began to fill with wate in a liquid state, and later as glacial ice.
That was a permanent change.
The details of how much water the oceans and glaciers hold, does keep changing as you noted. That the earth’s land was no longer universally dry everywhere, but that liquid and frozen water existed all over the earth surface, was a permanent change that has never been reversed.