I'm pretty darn sure net neutrality regulation was there to promote competition, protect consumers, etc. (see: commerce clause, among others) rather than to protect people's first-amendment rights. Notwithstanding how you may have personally viewed it, you're gonna need some serious citations if you're going to seriously argue the regulation was there due to 1st-amendment free speech concerns. Here's a link from my end to get you started.
https://www.forbes.com/sites/washingtonbytes/2017/03/10/the-...EDIT in response to your edit: you dodged this pretty cleverly. Senators say a lot of wrong and even contradictory things (I hope I don't need to waste time finding you videos), and like any interest group, EFF stretches arguments beyond their applicability to support their agenda. (Not saying they have bad agendas! But having a desirable conclusion doesn't imply good arguments are being provided for it.)
There are pretty clear lines between:
[1] "some senators (and EFF) feel a lack of net neutrality would violate the first amendment" (which wasn't your argument, and if it was, is a pretty weak claim),
[2] "net neutrality was there to protect first amendment rights" (which was your argument, and the one I was asking you to support, and a pretty easy one to prove if correct -- all you need is to quote the rationales for the net neutrality regulation we had), and
[3] "lack of net neutrality actually violates the first amendment" (which you've been arguing towards, but which would require case law as proof, not senators' feelings)