No, freedom of speech is about the government censoring your ability of speech. You are free to stand on a street corner and yell to the world but it does not require anyone to listen to you.

This person is advocating for a non-governmental website that is for enabling free speech since they see some voices as being silenced. But with that comes the ability for people you disagree with the speak as well. No government censored Parler, it was people who disagreed. What if this new service is overrun with people who disagree, will it be swept away in shadow posts or will people who say disagreeable things actually see that.