Yeah I intended to point out Socrates is being uncharitable in his Hercaclitan view. I’m not super familiar with Heraclitus, but I doubt he would think facts about geometry are in flux. Maybe I’m missing some of the nuance of your question, but further explanation on the end of Heraclitus is needed to make sense of “everything is in flux". Perhaps the internal angles of triangles are slowly contouring to less or more than 180 degrees, but very slowly as to not be perceptible. I don’t think Heraclitus thinks this and it’s what Socrates seems to be saying is his belief--which to me seems to be an absurdity.