Isn't that table for full-on Artifact-power items?
Is there a method of curing the effect given? Pretty sure that there wouldn't be an easy way of losing actual ability points permanently.
(Although at level 17+ when artifacts might come into play, the "cure" might be a wish spell admittedly.)
It is curable by greater restoration, but otherwise it is permanent. Everything in the game is curable by spells one way or another.