Yes, Free speech and all you know...

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No, I don't know. Free speech doesn't apply here.
The First Amendment to the Constitution has no application here. This is not a government owned website. It's a private site that the public is invited to attend, subject to its own rules, and after that only subject to legislation that does not allow discrimination on the basis of race, religion, etc. But you can find a lot of sites on the internet who do that and the government does not intervene.
If the owners or moderators want to banish any or all posts that are critical to Tesla, or vice-versa, they can do it without explanation and without breaking any laws. In my view, they do a great job of moderating both extremes.