There are so many problems with the comment that I am gonna just say: I doubt it...
Also we did see a launch title... It's called Godfall
I don't think any Godfall footage has been from PS5. It's all been on PC.
The main thing that makes me thinks this is fake is that he puts all the blame on Sony being over confident. What does that have to do with them failing at heating issues? They were so overconfident that they just failed at completely designing it and instead just netflixed and chilled? Doesn't make sense. If this is happening it's not because Sony was to overconfident it was just a huge mistake on their end.
I could see overconfidence being an issue. All of the leaked documentation shows that the initial plans were for 9.2TFLOPS. It's completely possible that they quickly boosted frequencies of the console when there were grumblings of the Series X having over 12TFLOPS of performance. When you look at the clock speeds it makes perfect sense. 2.23Ghz with the 36 CU's is 10.28TFLOPS, but it if you decrease it to 2GHz brings it exactly at that 9.21TFLOPS of performance that was originally leaked. Overclocking would definitely cause more thermal issues, especially since they are doing it for both the GPU and the CPU. Which, it's not uncommon for a manufacturer to increase clock speed to get more performance out of an unlaunched console. The Xbox One did this, as an example.