Oh, yes. Arthur could secretly read minds and had just left it out in his conversations to everyone. For fun, you know. So they didn't censor their thoughts around him. Arthur Curry, evil genius.
"I'm better at everything," Arthur responded very casually as he lifted the cushions off the couch. Underneath them was a handle. Ah-ha. "I've got good news," he said, motioning to the handle he had uncovered. "You get a full-sized bed."