Tribalfootball is not a reliable source. Much of it is not true.
Berlusconi has a very rich bank account, let's put it like that. It's not like you can point out a club in the world that has better options of buying players based on the cost. We can basically buy who we want, it's not like it's different than Chelsea.
The only thing of it is that Milan has a strategy of buying player for less money and so on.