Do you know that’s the halacha, or are you theorizing how you would make the halacha if you were Hashem?
HKB”H didn’t lie to Avraham for sholom, he merely didn’t repeat everything.
When Yaakov misled Yitchok about his identity, he said it in a way which was not an outright lie, but had two connotations.
So we do, in fact find that even where it’s muttar to lie, it’s best to minimize.