No, that's not accurate. Anyone can say whatever nonsense they want to, in areas where they are not prohibited. They can release a book, start a website, send out a mailer, run a cult church brick and mortar, give speeches to a university...the idea that this is oppression, is absurd.
What it is, is discrimination, against lies/nonsense. As long as you primarily value reality/true to make important decisions about the nation, nothing changes. If you really want lies/nonsense to be front and center to making choices about policy, things that affect your health, finances, etc., then yes, you'd be oppressed. Just as criminals are oppressed. Just as junk science is oppressed. Just as hateful, vocal racists are oppressed.
In science, an opposing idea is also irrelevant. What matters are two primary things:
1. are they using good evidence (repeatable testing, math, experimental data, etc.) to show something is the case.
2. are using good evidence to show something someone else has claimed is the case, is not.
Such systems have led to unprecedented volumes of truths about reality to be available to the public/world, the opposite of systematic oppression.
You can see this in medicine. Trying to market the supplement Airborne, as something that prevents or cures a disease, is prohibited by law. This is not systematic oppression. Anyone can promote any drug, as long as it is verifiably true. If not, they cam still make, market, and sell it (! not oppression at all), they simply can't sell it as a drug (cures or prevents, etc.)
You can see this in journalism already. In this case, journalistic code of ethics, ombudsman, and a decent culture around it., help to differentiate certain types of journalism from some random person spouting nonsense (Alex Jones).
Alex should be allowed to find a platform and spew his nonsense to an audience, that's not the issue. He may need to adopt something similar to a food label though...or a drug label, or a political add notification of who paid for it...they may need to disclose certain facts about their product, up front.
Just like nearly every industry in the U.S. So no, not oppressed, unless you label everything "oppressed", in which case it's moot.
