I assume virus creation is more like building a house. It involves physical work and chemical reactions that need time to finish in correct order. Each attempt costs a LOT more of time&money and involves actual risks.
The reason we dont see any serious attempts to create a deadly pandemic is not that we keep insane people out of labs, because there is no way to find out if someone is a cultist or murderous psycho when they have every reason to actively hide it. Its because a) most people are not evil and b) a virus that can kill everyone it touches would probably kill its creator first.
As someone with basically zero bio experience I think I could get a working smallpox or ebola level virus in a year or two if I had time to learn, lab equipment and Annas Library. No LLMs needed. But I dont want to do that, and I think its the same for all the people who could do it right now.