I believe that's still the contingency plan in the unlikely event that they have to evacuate the ISS in the period between Starliner undocking and Crew-9 docking.
Yes it is and it is not the first time having such contigency plan.
Quite recently there was a Soyuz with crippled cooling and the contingency plan for the American astronaut that came with it was to evacuate via Dragon if there was an emergency before new Soyuz arrived.
