Yes with levels that high it is possible to kill a shrimp . What were your other perameters specifically your PH ,nitrAtes, and NitrItes that is another ?
I would lower it over a week period by taking out a cup or two and adding fresh water . Checking before and after , if you by chance get to low you can top off with salt water . But you should be ok ...
Mine was off by 1.033 on ours when it read 1.023 upon checking against our refrac we found it to be way higher than it should have been and that was brand new out of the pack , if the rubber stopper inside gets moved just a bit it will throw it out of wack big time ... Refracts are not that expensive compaired to constantly worring or buying new hydrometers on a bimonthly basis