I can also confirm (I have a 3:1 match).

Unless we build more land (either in the ocean or in space)?

There is Dario's written testimony before Congress, which mentions existential risk as a serious possibility: https://www.judiciary.senate.gov/imo/media/doc/2023-07-26_-_testimony_-_amodei.pdf

He also signed the CAIS statement on x-risk: https://www.safe.ai/work/statement-on-ai-risk

He does start out by saying he thinks & worries a lot about the risks (first paragraph):

I think and talk a lot about the risks of powerful AI. The company I’m the CEO of, Anthropic, does a lot of research on how to reduce these risks... I think that most people are underestimating just how radical the upside of AI could be, just as I think most people are underestimating how bad the risks could be.

He then explains (second paragraph) that the essay is meant to sketch out what things could look like if things go well:

In this essay I try to sketch out what that upside might look like—what a world with powerful AI might look like if everything goes right.

I think this is a coherent thing to do?

I get 1e7 using 16 bit-flips per bfloat16 operation, 300K operating temperature, and 312Tflop/s (from Nvidia's spec sheet). My guess is that this is a little high because a float multiplication involves more operations than just flipping 16 bits, but it's the right order-of-magnitude.

Another objection is that you can minimize the wrong cost function. Making "cost" go to zero could mean making "the thing we actually care about" go to (negative huge number).

One day a mathematician doesn’t know a thing. The next day they do. In between they made no observations with their senses of the world.

It’s possible to make progress through theoretical reasoning. It’s not my preferred approach to the problem (I work on a heavily empirical team at a heavily empirical lab) but it’s not an invalid approach.

I'm guessing that the sales numbers aren't high enough to make $200k if sold at plausible markups?

In Towards Monosemanticity we also did a version of this experiment, and found that the SAE was much less interpretable when the transformer weights were randomized (https://transformer-circuits.pub/2023/monosemantic-features/index.html#appendix-automated-randomized).