Theoretically every piece of info you need to program the whole computer stack from low level to high level is out there on the internet too. But, LLMs make it easier for more people to do the thing who couldn't connect these disparate pieces of information and fit it into their own brain previously. That is what they are trying to do with this sort of research, to see how easy it is for people who might have an axe to grind to get a viable turnkey solution out of them without needing a PhD in virology. There are probably a lot of people who have an axe to grind in some way, either of 'sound' mind or not.