The above screen capture is dated June 12, 2019. According to the linked post, the reverse service, from T5 to the domestic terminals, was scheduled to start on that Friday (June 14). Since no one posted anything to the contrary, I assume that it did.

Your arrival from a pre-clearance airport is identical to an arrival on a flight which departed from a domestic airport. You exit the airplane at a normal (that is non-sterile) gate in the terminal. You do not have to pass through security before proceeding to another gate, including the one where the Terminal Transfer Bus is located.