There is no self, so there cannot be an absolute self. It is a construct of the mind. The self is the ego.
An analogy for this is a mirage in a desert.
You see water shimmering ahead - it looks completely real, you feel thirsty for it, you’d fight to reach it. But when you get there… nothing. Just heat waves. The ego/self is like that mirage. It looks and feels super real (especially when you’re angry, afraid, proud, or craving), but there’s no solid, unchanging “you” hiding behind your thoughts, feelings, and body. It’s created by heat (conditioning, survival instincts, thoughts rubbing against each other).