He's been in the news almost constantly talking about both those projects and just announced a milestone with the Boring company, so I don't think it is complet

He's been in the news almost constantly talking about both those projects and just announced a milestone with the Boring company, so I don't think it is completely out there to believe the author might have been referring to Musk's efforts. After all you think both those projects by Musk are outlandish and would use the word "fantasy" to describe them maybe so did the author, but forgot to mention Musk specifically or chose not to for whatever reason. Suffice it to say I don't think they are fantasies at all and not sure why people keep characterizing such Herculean efforts that require so much will and drive as such and are so keen to so easily dismiss them instead of admiring them.