It is helpful to differentiate a legal opinion from THE LAW
[picturing Sylvester Stallone in Judge Dredd]
Here's another link I posted a couple days ago that people "don't care" about.
Section 2511 (3) is merely a disclaimer of congressional intent to define presidential powers in matters affecting national security, and is not a grant of authority to conduct warrantless national security surveillances. Pp. 301-308. 407 U.S. 297, 298
The thing about the law is that it is complicated and has many many pieces. You can come up with an argument for any position you choose and find cases for support. Lawyers do this all the time.