If you do a sensitivity analysis on the most important variable (how much Moore's law will improve FLOPS/$), the output behavior doesn't make any sense, e.g., Moore's law running out of steam after "conventional" improvements give us a 144x improvement would give us a 34% chance of transformative AI (TAI) by 2100, a 144*6x increase gives a 52% chance, and a 144*600x increase gives a 66% chance (and with the predicted 60000x improvement, there's a 78% chance), so the model is, at best, highly flawed unless you believe that going form a 144x improvement to a 144*6x improvement in computer cost gives almost as much increase in the probability of TAI as a 144*6x to 144*60000x improvement in computer cost.
The part about all of this that makes this fundamentally the same thing that the futurists here did is that the estimate of the FLOPS/$ which is instrumental for this prediction is pulled from thin air by someone who is not a deep expert in semiconductors, computer architecture, or a related field that might inform this estimate.
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If you say that, based on your intuition, you think there's some significant probability of TAI by 2100; 10% or 50% or 80% or whatever number you want, I'd say that sounds plausible but wouldn't place any particular faith in the estimate. But if you take a model that produces nonsense results and then pick an arbitrary input to the model that you have no good intuition about to arrive at an 80% chance, you've basically picked a random number that happens to be 80%.