Don't Arahats know Buddha?

While reading Bodhidharma's Two Entrances and Four Practices , I found Bodhidharma telling Arhats ain't enlightened. > Among Shakyamuni's ten greatest disciples, Ananda was foremost in learning. But he didn't know the Buddha. All he did was study and memorize. **Arhats don't know the Buddha. All they know are so many practices for realization, and they become trapped by cause and effect.** Such is a mortal's karma: no escape from birth and death. By doing the opposite of what he intended, such people blaspheme the Buddha. Killing them would not be wrong. The sutras say, "Since icchantikas45 are incapable of belief, killing them would be blameless, whereas people who believe reach the state of buddhahood." Is it true or I am wrongly understanding Bodhidharma? ---------- Note that Killing them won't be wrong is just a figure of speech. It isn't meant to be taken in literal sense.