The article doesn't really add much that we didn't know already (through other articles). You can search EARN IT on here or EFF for details or Signal's write-up on it. They want to hold people liable for "reckless endangerment" for offering anything that could be used to facilitate child exploitation.

Encryption by it's very nature makes it very difficult to pursue, Barr has pushed much rhetoric of what he would push in the committee for this bill, and the writers of the law refuse to specifically exempt encryption despite having many opportunities to do so.