Technically incorrect statement in "Why is Ethereum switching to Proof of Stake (PoS)?" FAQ

> Should a malicious actor try to tamper with the underlying protocol by using a large number of validators to revert a finalized block (the equivalent of a "51% attack" in PoW) their funds are slashed — meaning they lose a portion of their staked ETH.

While this is true, the author did not mention what will happen if the attacker acquires 66% ETH. In this case they can do any attacks without being slashed, as they will fully control the beacon chain.