haha. Has anyone ever proved the conspiracy theory that Tether prints money out of thin air? Nope. Despite people making that claim for many years there is zero proof its true. It's just a crackpot theory for conspiracy theorists and for people who want to argue that Bitcoin has no value because it's all from fake Tether money haha.
That's a weird way of putting it since the two are weakly linked. In other words even if you could manage to prove that Tether is not printing tokens out of thin air and is backed by dollar 1:1, you still have to prove that the tokens they print are going into bitcoin!
A quick look at the trading volumes shows that more than 90% of Tether trading volume is from its altcoin pairs not bitcoin... So if anything Tether printing is pumping altcoins not bitcoin...