For starters, the test you mentioned happened in 2013, after making improvements, they successfully redid that test in 2017. Visiting the ISS does not involve

For starters, the test you mentioned happened in 2013, after making improvements, they successfully redid that test in 2017. Visiting the ISS does not involve the reentry capability, and being a test flight, on the journey back, they won't be attempting to bring down any cargo they can't afford to lose. They're saying it's preparing to visit the ISS because that literally is the objective of the first test flight. Maybe they've pulled a Boeing and it has too many issues to make it there, but the only way to find out is to actually launch it and attempt to head there and back. As for carrying crew, that's still far away, they don't have a commercial crew contract from NASA, and are instead working with Blue Origin to provide transportation to their commercial space station. Given Blue's rate of getting things done so far, this is probably going to materialize well into the 2030s, if it materializes at all.