The article talks about the SpaceX Crew Dragon spaceship that successfully returned to Earth from the International Space Station (ISS) on May 2, 2021, with four astronauts on board. However, the Boeing Starliner spacecraft, which launched on a test flight to the ISS in December 2019 without a crew, is still in orbit and has not returned to Earth yet. The Starliner suffered from software issues during its mission and did not dock with the ISS as planned. Boeing and NASA are currently working on a second uncrewed test flight before the Starliner can carry astronauts to the space station. Therefore, the response to your question is that two astronauts are not waiting to return to Earth on the Starliner, as the spacecraft is not yet ready to carry a crew.