bd – from what I understand thats not true, it simply requires a higher level of tshuvah.
On Yom Kippur we use 3 expressions of forgiveness, “kapper” means to wipe away, the meforshim explain it to mean that no trace should remain.
I would guess that he meant it in a more practical way, like things in his brain or things he saw. More complicated, but there too I don’t think its justified.