Congress already gave him the authority: 50 U.S. Code  1701 and 50 U.S. Code  1702
From what we know so far, Mr. Pai's rationale for eliminating the rules is that cable and phone companies, despite years of healthy profit, need to earn even more money than they already do -- that is, that the current rates of return do not yield adequate investment incentives.
CEOs of various telecoms have been asked during quarterly earnings calls how the implementation of net neutrality and later its repeal would affect their bottom line. They have said it would not. They are legally required to provide accurate information during such calls (and can be sued for breach of fiduciary duty if they don't).
Such statements will be used against Pai when the FCC gets sued over this.
It says exactly what I said it does. Quoting verbatim from that decision: "Our cases make equally clear, however, that reasonable "time, place and manner" regulations may be necessary to further significant governmental interests, and are permitted."
I don't like them, but as long as they are content-neutral then they are constitutional. That being said, they become unconstitutional the minute you start forcing your critics to use them but don't do the same with your supporters.
Top Ten Things Overheard At The ANSI C Draft Committee Meetings: (6) Them bats is smart; they use radar.