I don’t like that definition because it makes the word meaningless. Omnipotence means all powerful (with in the reference of the speaker, or whatever constraints of the word “power” the speaker is using.) If omnipotence is incomprehensible, then maybe we should invent a different word to convey that idea, perhaps “Godly”. As it is, omnipotence as a word has value in the English language that is distinct from God. Same with Omniscience, or any of the other Omni’s.