Faith is trust. Trust allows you to go to the source of the power. Trust isn't the power. The reference to the placebo seems to imply that faith is the power itself, such that a physician can give you a placebo, like a sugar pill, which has no medicinal qualities, but you think it does. What this illustration shows is nothing about faith, but the power of suggestion.
Someone can give a placebo to a person and that placebo can make that person feel better.
By the way, the placebo doesn't cure the disease. When you have a real disease, it doesn't cure anything. If that were the case, then sugar pills would be used to cure everything. This makes a very important point. Even though you have the faith to take the pill, in other words you are encouraged to act in trust by taking the pill which you think will do something for you, you will die unless the pill really has the capability to make you well.