Now I don't know which language they used for the project (could be python or could be C/C++ or could be rust) but its like "python would have been good at subsets of that project", so some impact already and these python tools only get better
Did python remove the jobs? No. Each project has their own use case and in some LLM's might be useful, in others not.
In their project, LLM's might be useful for some parts but their majority of the work was doing completely new things with a human in feedback.
You are also forgetting trust factor, yes lets have your traffic lights system be written by a LLM, surely. Oops, the traffic lights glitched and all waymos (another AI) went beserk and oops accidents/crash happened which might cost millions.
Personally I wouldn't trust even a subset of LLM code and much rather have my country/state/city to pay to real developers that can be accountable & good quality control checks for such critical points to the point that no LLM in this context should be a must
For context, if LLM use can even impact 1 life every year. The value of 1 person is 7.5-13 million$
Over a period of 10 years in this really really small glitch of LLM, you end up in 10 years losing 75 million$
Yup go ahead save a few thousand dollars right now by not paying people enough in the first case to use LLM to then lose 75 million $ (on the least case scenario)