People have been talking about this for years and it has always scared me away from crypto. Which is obviously something I regret now. The truth is that this person doesn't offer a shred of evidence as to why this crash will occur in 2022. It could happen in 2023, 2025, 2055. Nobody knows. Maybe it will never happen.
Is Tether a scam? Sure. But you're also getting scammed if you are holding cash. I don't really know what strategy to follow in these uncertain times other than simple gut instinct.