Scientists believe, believe so, evidence suggesting, might be, could be lunar in origin, a more likely source . In other words, the title—“ This Near-Earth Asteroid Is Actually A Chunk Of The Moon,” is nonsense. They don’t now anything except a new grant proposal.
Not exactly nonsense, but it does state a conjecture as a fact. It is, however, a pretty solid conjecture. It is difficult for anything not gravitationally bound to the earth (like the moon and the ISS) to remain in an orbit around the sun and near the earth for very long. The orbital energy and deployment geometry have to be just right. One place where those conditions apply is near the moon, and after a meteor strike. Most of the debris from a meteor strike on the moon falls back on the moon. Some strikes earth as meteors. Some goes into orbit around the sun. And some of the debris (just the luck of the draw) winds up in funny orbits that interact with earth.