You don't seem to understand the timelines of designing chips like that from scratch.
Dojo has been in works for almost 7 years. Tesla will continue to work on this for the next 20 years. There will be Dojo v2, Dojo v3 etc. just like at SpaceX there was Falcon 1, Falcon 9, Falcon Heavy.
This still might end up a failure but they clearly feel confident enough to talk about Dojo publicly, which wasn't the case for the first 5 years of its development.
There is no doubt that it is an amazing piece of tech but I’m not confident Tesla will be able to pull off beating NVidia. Especially when compared to NVidias Tensor Cores and economics of scale. I don’t like their whole approach to self driving ML. I know a lot of people disagree with me so I would rather not get into it.
I think a lot of the talk of future performance is posturing in order to get NVidia chips at cheaper prices.
I think with better ML they wouldn’t need so many chips, be it NVidia or Dojo.