The mistake that is allowed to persist is the frame of reference in relationship to time.
Astronomers use NOW as the point of reference and this is their mistake. Any description of reality must include some kind of temporal measure of WHEN events occur. If one demarcates time by starting the clock at the moment of creation, then there is no confusion or misleading description as to whether or not space is accelerating or decelerating.
This same problem compounds itself about the description of a universe that is accelerating. This discovery is based upon the intensity of Type 1a novas observed at the greatest red shifts. They are dimmer than a straight linear rate of expansion would have predicteded. But the observation of these distant novas are in the distant past. So in the very distant past the rate of expansion was even greater.
An object that is moving faster in the past than the present is decelerating.