It’s important to note that the “true tempo of early animal evolution” exists in evolutionists’ imaginations, not in the rocks.
Explaining this sort of phenomenon by slight, successive modification, as Darwin envisaged, seems problematic.
Lents studies rotting corpses and household plants. He might not know much about (living) human physiology.
Novelist Barbara Kingsolver seriously asserts, in her review of a novel in which trees are characters, that they are people too.