The article you linked is about brutal mistreatment and forced "disinfection" of people crossing a border. As horible as that is, do you truly believe that is the same scale of evil as systematic genocide?
I'm not American and that article doesn't mention liberalism, so I'd appreciate it if you highlight the connection there too.
I think you may have quoted the wrong thing. The section you highlighted above states that clothing was fumigated with the same gas later used by Nazis to exterminate prisoners, it makes no mention of it being a way to "medicalize" or make exeuctions "humane".
Again, I'm not American so I'd appreciate it if you highlighted how this is related to "American Liberaism" which you initially criticised. As it is it appears you're assuming whatever actions the someone in power in America takes is "American Liberalism", I'm not sure that's something I agree with.