Just to add Some more differences in this comparison to shabbos in a concentration camp:
5- techeiles was all Jews, the holocaust was not even close; 6- techeiles the cause of cessation was a lack of knowledge, meaning that the cause isn’t necessary to be constantly happening; shabbos is only stopped due to ongoing constant active suppression, the moment of whose removal the problem blocking shabbos ceases to exist and by definition proper observance is restored.