Personally, if I were going to publish something like this as a leader of a major AI company today, I would actually try very hard to put together a good faith proposal that I genuinely believed to be in the best interests of the public.
I can't speak to this particular proposal or the motivations behind it, but I think my approach is the smart play in the present circumstances. Why publish something brazenly self-serving that will at best be forgotten two weeks later, or at worst be added to the list of reasons a bunch of people have to hate you, when you could instead earn some goodwill as a benevolent thought leader and maybe get some academics and politicians to come out of the woodwork backing your ideas?
If the industry is successful and a particular player doesn't fall behind the competition, they're going to be making obscene amounts of money regardless. Better to have a happy and successful public that can't imagine life without you than a public in Great-Depression-like conditions that wants you dead and will only vote for politicians who campaign on banning your product.
As an aside, I'm not sold on the idea of taxes that specifically increase the cost of AI. I don't think it's wise to disincentivize AI usage or artificially inflate costs. (That would particularly hurt anyone with use cases that aren't connected to immediate profit.) If AI has the impact most of us would like it to have, the economy will become way more productive and the public will get its share of that through corporate taxes anyway. I'd rather just close tax loopholes and start laying the groundwork for a future system of distributing resources in a post-employment world.
My current preference is a guaranteed educational/training stipend for any unemployed adult who wants one, and changing the standard career advice for the next generation from "learn to code" to "learn to startup". Looking forward a decade from now, if employment as we know it is scarce, but the economy is flush with capital and automated labor is dirt cheap, it seems to me that self-employment will reemerge as the dominant career path — and anyone who can't raise funding for their business (or acquire grants for their research) will simply need to keep leveling up until they can. Maybe eventually we'll have the resources to transition to a full UBI, but in the meantime, we'd need a transitional system that could provide for the unemployed masses without incentivizing everyone else to suddenly quit jobs that were still necessary. Just my 2c.