And despite your valiant efforts, still a truism. When you interpret "all" as "all those who repent," your verse ends up saying "all those who repent should come to repentance." That doesn't pass the smile test.
And Moses said unto God, Behold, when I come unto the children of Israel, and shall say unto them, The God of your fathers hath sent me unto you; and they shall say to me, What is his name? what shall I say unto them? And God said unto Moses, I AM THAT I AM: and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you. Exodus 3:13-14
Truisms should not be dismissed simply because they are truisms.