To play devils advocate, why wouldn't people in tether just switch over to BTC or another crypto? Everyone has had the idea that tether was shady since it began. I don't see this having much of an impact on anything. This certainly isn't going to "crash exchanges"
Read his warning, we will see spike on coins as people exit. Tethers.
Then as people exit exchanges to wallets and banks the exchanges don't have enough coins to exit since they all used fake USD Tethers.
So exchanges can't meet exits they crash.
People lose faith in Tethers they go to coins prices spike then exits expose the scam.
It's doing exactly what he warned look at the exit of tether spike.
It's happening