Sure, didn't think you did claim that, you were just pointing out what the article said.
I think it's a stretch for the article to say that because federal funding will have strings attached it should be rejected to attain "intellectual freedom". But private funding also comes with strings attached. So I guess you could be free to be unfunded if you don't want any strings.
The last part of the article reveals more about the political thinking behind it, when it says:
"When government coercively seizes your money and uses it to subsidize some research program or viewpoint for any reason, it is violating your intellectual freedom."
Whose money is being coercively seized here and whose intellectual freedom is being violated? It's not talking about the universities here.
It very much looks like a typical libertarian "all tax is theft" and "government shouldn't take my money to do things I don't like" argument. Not sure they are really concerned with freedom here, other than freedom from government.