Being picky here - as a wheelchair user myself - but why single out parastoanauts - these folk will be astronauts, pure and simple.
Because they're not astronauts - they're participants in a feasibility study. If any ultimately make it to being an AsCan and ultimately qualify to the Astronaut Corp then yes - they will be an astronaut like any other.
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In a first for ESA and human spaceflight worldwide, ESA is looking for individual(s) who are psychologically, cognitively, technically and professionally qualified to be an astronaut, but have a physical disability that would normally prevent them from being selected due to the requirements imposed by the use of current space hardware.
ESA is ready to invest in defining the necessary adaptations of space hardware in an effort to enable these otherwise excellently qualified professionals to serve as professional crew members on a safe and useful space mission.
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They're looking for individuals who currently cannot become astronauts because of limitations in existing space hardware design. ESA wants to work on that, presumably with a view to lifting those requirements in future selection campaigns (and possibly putting some of the feasibility study participants though into a suitably modified selection programme).