Watch the source - Avi Loeb has a poor reputation among solar system astronomers _and_ scientists who work on SETI and exobiology, due to poorly supported claims of alien (meaning intelligent) origin for many different things, including 'Oumuamua, the first interstellar object found.
We'll get more data on this object as it comes deeper into the solar system. There's a lot of speculation going around, so don't over-index on any one person (but especially not this one). Odds are good it's "just" a very interesting comet.
