Unless Tether itself is the entity on the other end of that transaction. From Tether's reserves report, it has $82.42bn of reserves against $82.26bn in liabilities ($82.19bn of which are the tokens), for a net equity position of about $160m. However, its reserves include $4.9bn of "other investments (including digital tokens)".
Suppose that's all bitcoin, which is valued at "cost less impairment" (i.e. the lowest price bitcoin reaches since the purchase), and bitcoin drops by 10%. That would wipe out about $490mn of equity, putting Tether underwater. The same could happen with a similar drawdown on $3.7bn in "corporate bonds, funds and precious metals," which are marked to market.
Suppose that's all bitcoin, which is valued at "cost less impairment" (i.e. the lowest price bitcoin reaches since the purchase), and bitcoin drops by 10%. That would wipe out about $490mn of equity, putting Tether underwater. The same could happen with a similar drawdown on $3.7bn in "corporate bonds, funds and precious metals," which are marked to market.