If you read the article, these people are not citizens of the united states...
Lovely stance... Also, the headline question is if it's safe to travel there.
Sounds pretty unsafe to me.
https://time.com/7269604/el-salvador-photos-venezuelan-detai...
Moreover, the First Amendment is held (not just philosophically, but this is the legal theory behind its incorporation against the states under the 14th Amendment) to be declarative of a universal right (a right "fundamental to ordered liberty"). It is therefore monstrous to try to excuse its violation by the US government against any person subject to its power under any circumstances.