'Stars billions of light years away' definitely a possibility, but can the distance be100 % accurate ?

Lets go back to the Super atomic cloud suggested by A Einstein and SN Bose in 1924. Atoms crowded close enough in ultra low temperatures would lock to form a single slob of solid matter which can produce waves that behave like radio waves. This principle can be used to slow down light to almost a stand still to 1cm/s. And we know that this is going to revolutionise data handling methods in the near future. Imagine light rays from a particular star is interrupted by these kind of super atomic clouds and we never knew of them being present, where some may be even billion miles across, before it reaches us, what are the implications on our studies? Say after some time these interrupting clouds move away from that particular star light, and say after it comes back in between again. Although we might falsely pick up the 'super atomic cloud' as that star, but actually, that real star may be still beyond, back in time !