# How can the policy iteration algorithm be model-free if it uses the transition probabilities?

I'm actually trying to understand the policy iteration in the context of RL. I read an article presenting it and, at some point, a pseudo-code of the algorithm is given :

What I can't understand is this line :

From what I understand, policy iteration is a model-free algorithm, which means that it doesn't need to know the environment's dynamics. But, in this line, we need $$p(s',r \mid s, \pi(s))$$ (which in my understanding is the transition function of the MDP that gave us the probability of landing in the state $$s'$$ knowing previous $$s$$ state and the action taken) to compute $$V(s)$$. So I don't understand how we can compute $$V(s)$$ with the quantity $$p(s',r \mid s, \pi(s))$$ since it is a parameter of the environment.