> The author doesn't talk at all about the hardware aspect of this stuff such as the surprisingly short lifetime of the GPUs that are being rolled out at a break-neck pace.

There is literally a section that begins, "What will be the useful life of AI assets?" In bold.

Sure, but an informed opinion would mention that not only do these chips become obsolete quickly, but the ones that will survive long enough to become obsolete are likely to have a very fast and high failure rate.