This said, just because it's an argument from authority doesn't necessarily mean it's a good argument. You'll have to read and break down the arguments and weight them against other arguments and the body of knowledge we have.

If argument from authority was valid in itself, then LeCun would have killed LLMs like 300 different times now, and yet keeps being wrong.

Although they don't mention anything, the authors website seems like they are tee'ing up for a new start-up. They present their future ambitions (merging two technologies they know well) and that they recently left deepmind, so it at least smells a lot like laying groundwork for a new start-up.