So, to answer your question, where it says "all," it means "all", including the US Constitution, English common law, and common law as practiced in the sate courts of the US.
I'm open minded, but before I subscribe to a believe that Khan advocates Sharia be substituted for US law, I'd like to see something other than a scholarly dissection of Sharia followed by inference - that's CNN methodology, and it flat out doesn't work.
The remarks I excerpted are remarks made by Mr. Con himself. Whether there were other remarks that disassociated him from what the words mean might be a question, but the quotes attributed to him in the Breitbart article indicate he is all in for Sharia being the supreme law any and everywhere.
Unless someone can show where Con flatly rejects any idea that Sharia should be superior to the law in the US and other non-Muslim nations, then he absolutely believes there should be "No man's law above Allah's law".